One of ancient Etruria's most spectacular archaeological sites with impressive necropolises and rugged landscape.

Built entirely of interlocking pieces, construction of this Chinese Muslim house of worship required zero nails.

Two massive and unstable sinkholes are yearning to unite, and their consummation could be catastrophic.

The rusted hull of a WWII German destroyer pokes above the surface in a Norwegian fjord.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

Though technically an illegal structure, this eclectic DIY apartment complex is beloved by its residents.

This rusting remnant of the local herring industry is being given a second life.

An abandoned Soviet-era mining town in the mountains of South Kazakhstan.

The Brutalist building harbors an unusual inverted dome that swoops down over its central sacred room.

Haunting graffiti left by prisoners of the Spanish Inquisition.

This long-distance walking route follows the Prime Meridian line as it passes through England.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

These lesser-known Maltese catacombs date back over 1,700 years.

The alleged birthplace of Lady Jane Grey, who was executed at age 16 for claiming the throne of England.

The remains of the concrete ship can be seen during low tide.

The oldest surviving botanic garden in the United States.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

One of New Zealand’s few castles boasts beautiful gardens, grand architecture, and a history filled with family drama.

One of the most remote lodges in the Amazon offers rare wildlife encounters and undisturbed views of the Peruvian rainforest.

The only substantial part of Nazi Germany's formidable defensive line through Northern Italy that survives today, largely intact.