This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

This former Cyprus flight hub is now a crumbling, abandoned ghost complex.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

This massive mushroom has spent centuries eating its way across a huge swath of Oregon.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

Rocky Atlantic beach home to a stunning stone arch.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

A haunting collection of the vanished and disappearing natural world.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Tubing through a cave lit with glowworms is a magical underground experience.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

America's only nuclear missile silo open to the public.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

A swing to dangle you off the very edge.

A vast city of the dead, where the deceased outnumber the living by more than a million.