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

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The system of air guns are fired off remotely to scare any trespassing avians.

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

A former major munitions plant that has been converted into a sprawling art space.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

This elaborate towering structure was once famed for its revolutionary height.

This beloved marketplace mascot poops money and grants good luck.

An Irish Memorial commemorating those who perished due to potato blight.

One of downtown Berlin's last reminders of its Communist past.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A unique bridge with an equally unique view.

The fairy tale castle of the "fairy-tale king."

A small but immensely extravagant palace built by the "Night King."

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

The footprint of a frustrated devil in Munich's Cathedral.