Berlin's old airport.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A monument celebrating the idea of reaching inaccessible places.

This observatory within Europe's first dark sky park offers stunning views of the night sky.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

Climb inside an iron crystal magnified 165 billion times its normal size.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This kitsch eatery is chock-a-block with bric-a-brac.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

This black shoreline is made up of exploded lava particles.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The heads of two giant mythological water horses honor Scotland's horselord past.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The unbelievably opulent home built for an infamous newspaperman.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The largest earthwork effigy in the world.