Banksy's image of a naked man dangling from the window of a sex health clinic.

Both church and state get put to the torch in this annual festival in the "Bonfire Capital of the World."

These ancient ruins were the final resting place of King Henry II's mistress.

This unassuming passageway played a key role in one of the most important events in U.S. history.

This ancient Egyptian obelisk still bears the wounds of World War I.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

Every plane, auto, and bicycle in this collection is kept in working order and are regularly demonstrated to the public.

Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.

The seat of Buffalo government is a gorgeous Art Deco palace.

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

The romance of early commercial flight still fills this Art Deco destination.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

The beams of the New College, Oxford dining hall come with an amazing story.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The first memorial dedicated solely to the Black troops who fought for the Union.

A relic of FDR's brief foray into utopian urban planning.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

A portal into the bricked up canal that runs through the heart of Washington D.C.

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

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.