A modernist landscape of water and sci-fi concrete.

This winding road through an Italian canyon may be the most scenic drive in the world.

The wreck of a B-29 Superfortress now stands as a memorial left in the moors.

A unique collection of old miners' cave homes carved in to the hillside cliffs near Death Valley.

It's believed human settlements from the Palaeolithic Age were established not far from this canyon.

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

A desert that evokes the surreal.

The only natural cave bath in all of Europe.

One of Chile's most active volcanoes is riddled with beautiful caves.

One of few vertical lava tubes in the world accessible by foot.

One of the best-preserved early 20th-century ore-processing mills in Nevada is maintained in a state of arrested decay.

A Nevada mining boomtown that ran out of silver and luck.

Rich red almandine gemstones are waiting inside the volcanic rock strewn across this eastern Nevada hillside.

This little known mountain has claimed four times as many lives as Everest.

Geothermal waterfalls in Tuscany.

An Antoni Gaudí masterpiece in Astorga.

This mesmerizing and surreal landscape features intricate patterns of white and red sandstone.

This massive crater in the middle of nowhere was used to train astronauts for moon landings.

The world's only bushplane museum captures the spirit of the early planes and pilots and their contributions to northern life in Canada.

Robots, lasers, and whoopee cushions, oh my!

A wonderland of caves in eastern Iowa.

Hidden in the grounds of the Fort Dodge Museum is a "real" and terrifying petrified giant.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

An eclectic assortment of medieval architecture in a small Iowa town.