When it opened during the final years of the embargo, all the drinks and cigars were free.

The last remaining building in Washington, D.C., built by H.H. Richardson, one of America's most iconic architects.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

A celebrity from the late Cretaceous period.

This grisly headstone doesn’t seem to be resting in peace.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

A clone of a cloned tree that was so important it allegedly had its own guards.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

One of the oldest standing structures in Montgomery County, Maryland.

Home to two notable early-20th-century Black educators, Lucy Slowe and Mary Burrill.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

A historic Maryland home that once belonged to a man who has been called "the most insignificant" U.S. Supreme Court justice.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

This general store has stood in the same spot for well over a century.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A remote horde of architectural treasures fit for Indiana Jones.