This declassified Cold War bunker hosts a large collection of Swedish aircraft.

This French chateau is home to the world’s largest private collection of fighter jets.

The immortal Hollywood star rests in peace in an unassuming Swiss village cemetery.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

Scars from the English Civil War mar this medieval sanctuary.

A 19th-century cabin built into a hollowed-out Sequoia tree.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

A collection of 11 million buttons illustrates the human toll of the Holocaust.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

Five soviet prisoners of war were executed at this spot just days before the liberation of Norway.

The pockmarks across the building's facade are remnants of the Blitz.

You don't have to be an ambassador to dine like one.

A historic Black graveyard hidden in the parking lot of one of America's largest malls.

The oldest continually operating golf course in the United States.

The remnants of the base where US Army troops learned how to fight in extreme conditions.

The scars of World War II are preserved on its walls.

The only monument to name all of the passengers and crew who died on the RMS Titanic.

One of the few places where you can visit a cenote and Maya ruins at the same time.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

A stone pillar commemorates the surrender of the extraordinary Apache leader.

An abandoned town is hidden in Great Smoky Mountains National Park.

During the American Revolution, this mansion hosted failed peace talks between the British and Americans.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."