This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Overlooked amid the tourist bustle of Florence, this museum is dedicated to the craft of stone inlay.

A collection of retro plastic goods made with "the material of a thousand uses."

A B&B on a Victorian lighthouse station in San Francisco Bay.

The only theatre in the world constructed specifically for sound movement.

Explore 10 acres of environmental sculptures.

A gargantuan crystal kingdom.

Rippling sand dunes frozen in the Arizona rock.

A theme park attraction designed to turn your children into LARPers.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

The largest whale museum in Europe allows visitors to walk among life-size giants.

One of the world's largest ice festivals dazzles visitors for over a month with radiant sculptures and carvings.

Historic medieval fortified city in southwest France.