Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Exotic feline breeding compound and conservation center.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

Moss and stone turn this waterfall into an otherworldly liquid veil.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

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

The crumbling remains of a 19th century fortess.

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

A piece of outsider public art accompanied by a strange urban legend.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

The most powerful waterfall in all of Europe.

Moonbows over Kentucky.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

The loneliest island in New York.

The site of murders and Satanic cult gatherings.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

Crumbling ruins mark the site of a couple's grisly murder in the woods.