Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

An alien landscape of chalk-rock in the Egyptian desert.

A mysterious phallic rock on the grounds of a Buddhist monastery.

A beloved tribute to the Fab Four and the freedoms they inspired.

People have been scribbling on this massive chunk of granite for more than 1,500 years.

History, geography, and shamanism meet in this eye-catching monument to the greatness of three empires.

The oldest Buddhist monastery in Mongolia has survived centuries of invasions, political shifts, and religious purges.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

Enormous statue of the Emperor of the Mongols.

A 13,000-year-old mastodon skeleton was found during the construction of a 19th-century New York mill.

This historic church with a connection to "Uncle Sam" is now a fraternity house.

This relic of 19th-century infrastructure is one of the few remaining coal gas storage tanks in the U.S.