THESE ARE JUST DOTS I HAVE JOINED TOGETHER FROM FACTS I HAVE RESEARCHED. I AM NOT ASSUMING ANYTHING

Here I shall link Pierre L'enfant - The Society of the Cincinnati - 33 Degree Masons - James Alefantis - Pegasus Museum - Hilary Clinton - Tunnels - The Finders

A summery of Pierre Charles L'Enfant history is needed first.

Pierre Charles L'Enfant - (1754 – 1825) French-born American architect and civil engineer best known for designing the layout of the streets of Washington, D.C., the L'Enfant Plan.
Pierre Charles L'Enfant arrived in America in 1777 at the age of 23, and served as a military engineer with Major General Lafayette..
From 1780 he served on General George Washington's staff for the remainder of the Revolutionary War.
In 1783 he was promoted to Major of Engineers.
After the war ended he was one of the first people to join The Society of the Cincinnati and designed their badge.

The suggestion of the bald eagle as the Cincinnati insignia was made by Major Pierre L'Enfant, a French officer who joined the American Army in 1777, served in the Corps of Engineers, and became one of the first members of the Society.

The Society of the Cincinnati is the oldest hereditary society in North America starting in 1783. Building
In 1784 King Louis XVI ordained the French Society of the Cincinnati.Up to that time, the King of France had not allowed his officers to wear any foreign decorations, but he made an exception in favor of the badge of the Cincinnati. (The Illuminati were kicked out of Germany around this time and had connections in france)
George Washington was elected the first President General of The Society of the Cincinnati. He served from December 1783 until his death in 1799.
President George Washington appointed L'Enfant in 1791 to plan the new City of Washington who added a lot of masonic symbolism to the city plan. Pentagram Owl of Athena/Minerva
L'Enfant died in poverty, June 14, 1825. He was originally buried at the Green Hill farm in Chillum.

He may have died in poverty but the state sure has made up for it since his death

Since 1902 many of L'Enfants visionary plans have been far more instrumental in considering the lay-out and architectural plans of Washington.
In 1909 the state recognised his contributions so was dug up and moved to Arlington National Cemetery in Virginia. L'Enfants grave

Many more incidents of recognition happened since his death. So its safe to say L'Enfant was a well know and influential person at the very top of society. As he was an engineer, architect and a man of power and influence it would seem only natural he would join the Free masons. There is evidence to say he joined the Scottish Rite 33 degree masons in 1789 hence the masonic symbolism in the L'Enfants Plan of Washington.

The Scottish Rite Freemasons

Based in Washington, D.C., the Southern Jurisdiction (often referred to as the Mother Supreme Council of the World) was founded in Charleston, South Carolina, in 1801.

The Society of the Cincinnati predates The Scottish Rite Freemasons by about 16 - 18 years.

District of Columbia Scottish Rite http://dcsr.org/ NOTE LOCATION

NOTE: From Google maps it appears that The Society of the Cincinnati backed Cincinnatus Foundation is run from the same building as The District of Columbia Scottish Rite.
NOTE: http://thepilgrimage.org is across the street.
NOTE: Rev. Sun Myung Moons The Church of Unification is next door.

Supreme Council, 33°, Scottish Rite Freemasonry https://scottishrite.org/ NOTE LOCATION.

NOTE: The roof to Supreme Council, 33°, Scottish Rite Freemasonry building is exactly the same as the roof design for the Pegasus museum. This video explaining where the kill room was (which has been taken down multiple times and resulted in the reporter getting threatened by JA) touches on it.
NOTE: When I was searching for the links and video to the roof on Pegasus I came across this Voat by @mumma_ra. He mentions a person or interest called Paul Weil (former singer of The Apes). I sat up when I saw this because whilst researching Pegasus I came across this.(Link to Original Page).
NOTE: I've noticed Oriental Gate of Heaven in some other Masonic writings also. This could do with looking into.

Pegasus is the subject of a very rich iconography, especially through the ancient Greek pottery and paintings and sculptures of the Renaissance.

Morals and Dogma of the Ancient and Accepted Scottish Rite of Freemasonry is probably worth a read. It was written by Albert Pike.

Continuing this line of investigation took me to http://dcsr.org (more investigation needed) and a Scottish Rite Freemason Brother Basil Mossaidis.

Brother Mossaidis was born in Philadelphia, and has served as the Executive Director of American Hellenic Educational Progressive Association, commonly known as AHEPA, in Washington, DC since 2002.....Brother Basil is also very active in the Greek Orthodox Church, and has been honored by the Patriarch for outstanding service thereto.

Not only does it talk about his involvement with kids but he talks about being the Director of American Hellenic Educational Progressive Association, commonly known as AHEPA, in Washington, DC since 2002

Hellenism is the historical spread of ancient Greek culture.

The Center for Hellenic Studies NOTE LOCATION

Somewhere there maybe a link between AHEPA and the Acacia Brothers. This might help.

So who lives on the same rd as The Center for Hellenic Studies? HILLARY RODHAM CLINTON

HRC lives in Whitehaven House on Whitehaven Rd NOTE LOCATION
HRC lives at the end of a dead end road and her house backs directly on to a woodland park called Dumbarton Oak Woods.
In this article it talks about The Finders holding kids at an address in Glover Park NOTE LOCATION
That house is within a mile of HRCs house https://i.sli.mg/XQPxLU.jpg some of it through woods.
Dumbarton woods seems to have a lot of history (Reference, Reference)
There are numerous references to The Finders, The CIA and Georgetown.

One Last Thing

When I was researching tunnels in that area I found a tunnel runs from Georgetown Reservoir to McMillan Reservoir. Reference, Link