A 19th-century subterranean reservoir repurposed as a contemporary art cave.

An impressive collection of dollhouses and an homage to the frog-leg canning industry.

An ancient stone fortress considered by many to be the eighth wonder of the world.

Said to be one of Sweden's most haunted places, this vicarage once even attracted a ghost-busting priest.

A winding, blood-red tunnel of hardened lava navigable by foot.

A giant red chair bolted to a rock on a remote mossy hillside in Iceland.

These enlarged egg sculptures represent the native birds of eastern Iceland.

This tiny museum's sizable collection is jammed into a former underground public toilet.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

This fairytale-like structure is the last turf church ever constructed in Iceland.

A precariously balanced goose-shaped boulder with a dark legend.

The world's most famous cheese caves.

This forgotten Frank Lloyd Wright house is an architectural marvel at the end of a sleepy residential street.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

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

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

One of Frank Lloyd Wright's final works was this UFO church.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.