This historical Netherlands fortress still bears the marks of its single siege.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

A grassy pyramid named after a French battle.

A miniature city, once ruled by the Queen of the Netherlands.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Incredible labyrinth of man made caves.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

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 museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

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

On the Hudson resides one of the largest clocks in the world.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

Elvis's own personal tropical hideaway.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

Walk the whole Mississippi River!

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

A life-sized memorial to Harry L. Collins, the official corporate magician of Frito-Lay.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.