A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The original "capsule building" is a masterpiece of Metabolist architecture.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Where manatees are the snowbird vacationers in these balmy Florida springs.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Experience park where visitors are told to expect the unexpected.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Northern Ireland's Brobdingnagian stepping stones.

Ruins of a German Castle on top of a towering stone pillar.

One part local history, 99 parts gruesome haunted house.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Every autumn, this hillside is ablaze with red summer cypress.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Architectureal fantasy quarter of Rome.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A Japanese concept restaurant that feels like a party thrown by the monsters in your closet.