A submerged village appears when dam levels drop.

A small Portuguese cottage formed between boulders in the countryside.

Houses are tucked between, on, and underneath giant boulders.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

The fantastic architectural models of a French traveler.

Ancient paintings known as the "Sistine Chapel of Cave Art."

A grassy pyramid named after a French battle.

A visionary precursor to the Internet made of index cards.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

Macabre astrological automaton clock dating to the late 1400s.

A self built castle built by a salt worker in Brazil.

Dummies recreate radiological discoveries from history.

A seemingly endless landscape of pure salt stretches far across Bolivia.

This Scottish bridge seems to compel dogs to leap to their death.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

A battle between nature and architecture in the Cambodian jungle.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A swing to dangle you off the very edge.

This collection of solar timekeepers includes the world's first digital sundial.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

Six turbines towering over a wide road for passersby.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.