European castle ruins in an American state park are actually the product of death and grief.

Washington's iconic carousel has a nice piece of Civil Rights history.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Ruins from the Parthenon and petrified wood line the interior of one of the world's most famous monuments.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The Lincoln Memorial has inspired many, even though a word on the inscription appears to be spelled incorrectly.

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

A popular European tradition makes its way to the states on one of America's most famous bridges.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

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

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Man-made geyser that rises to the exact height of the Gateway Arch.

This replica of a Sarajevo fountain stands at the heart of the world’s largest Bosnian diaspora community.

One of few surviving standpipe water towers in the U.S.

The eccentric and colorful pavilions of Tower Grove park are a beloved and overlooked symbol. 

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

Less a museum than a bizarre fantasy world created by artists and engineers.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.