When flour explodes, it's not a pretty sight.

20,000 pieces in a Frank Gehry-designed building.

Funhouse of found art and participatory sculpture.

Hub of Scandinavian culture in a Minneapolis deli.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

Fire meets ice at the southernmost volcano on Earth.

A muddy alien landscape that is home to rare species of exotic plants.

Turnip-shaped island just off the Michigan shore in Lake Huron.

This railway-turned-greenway provides a pedestrian link in downtown Detroit and celebrates urban artwork.

Detroit’s downtown castle is one of the oldest structures in the city.

Medicinal spa created with the discharge from a geothermal energy plant.

Rising from the sea like a stone monster.

Three columns of volcanic rock shoot out of the ocean.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

270 million year-old forest of stone.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

An eerie, derelict amusement park in Berlin.

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

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.