One of the oldest and largest castles in the world.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

A Spanish-style estate that has traded black ties for rock concerts.

This urban oasis is a marvelous meld of music and landscape architecture.

This Hindu temple is an architectural marvel designed and built according to ancient Indian principles.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

A giant scale model giving a sneak peek at what urban planners see for Shanghai by 2020.

The freshest fish here are the ones you catch yourself.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This 140-year-old beacon off the Florida Keys marks the wreck of a Navy ship that once roamed the Caribbean hunting pirates.

A bizarre roadside attraction and the first instance of miniature golf in the world.

These Nubian pyramids are strange and unique, even by pyramid standards.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.

A Cuban artist reclaimed his impoverished neighborhood as a dreamy folk art kingdom.

Warsaw's fantastically preserved gasworks...almost.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

Built over an abandoned train yard, this hidden gem is full of winding paths and offers gorgeous views of Sydney Harbour.

Air-raid tunnels hidden beneath this opulent hotel provided shelter and an escape route—and one of the world's longest slides.

Taiwan's last Chinese character letterpress preserves the dying art of Chinese character mold making.

It houses the remains of a 17th-century version of the Titanic.

The picturesque remains of an abandoned silver mine slope down to Tagish Lake in the Yukon.