A herd of 150 bison live on California's Santa Catalina Island and are at the heart of an ongoing debate between environmental protection and economic expansion.

A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

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

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

A carousel trades in its classic horses and calliope for endangered species, native flora and fauna, and a modern soundtrack.

A one-of-a-kind collection of a unique medium.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

A red-brick beacon stands against the tempestuous Atlantic, on the windiest site in the United Kingdom.

Scotland's oldest medieval bridge is also among the last reminders of early medieval Aberdeen.

This picturesque archeological site looks like it was pulled straight from a fantasy novel.

A pagan tradition of draping trees with rags eerily lives on.

A corkscrew-shaped barn in Ireland.

Remnants of a Victorian garden feature sitting in public woodland.

An outsider folly near Madrid.

An octagonal folly tower overlooking the sea.

Obelisks and stone pineapples in the Irish countryside.

Don't be fooled by this fake medieval facade even if it is almost 300 years old.

An intriguing three-sided folly is a testament to one man's devotion to Catholicism and the number three.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The kind of mixed-up place that drives archaeologists crazy.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

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

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.