This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

A 19th century pearling and fishing village abandoned before Qatar's economic boom.

This 47-story "M" needed 20 years to be completed

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

A seemingly desolate park that belongs to two countries actually supports all kinds of wildlife.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

The summer tourists on these cliffs are thousands of seabirds.

Where hundreds of Japanese civilians committed suicide to avoid being captured by American soldiers during WWII.

This open-air museum was originally a World War II testing ground for German missiles and rockets.

This micronation's flag honors its favorite drink, Kaffegöken, or "cuckoo-coffee."

These massive moving sand dunes have swallowed an entire village and are still on the run.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

This peculiar border irregularity is the only way to legally enter Russia without a visa.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

This ship carrying cargo and four church bells for the Catedral Metropolitana Nossa Senhora Aparecida ran aground in 1968.

This South Pacific volcano has been blowing its stack for over 800 years and is said to be home to a cult leader waiting to be reborn.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

This abandoned radar site is slowly being taken back by the jungle, its mission cut short by the end of the Cold War.

These mysterious circular formations are actually remnants of 19th century gristmills.

All that remains of Jacques Cousteau's 1960s underwater "village."

A desert island with both a buried treasure and a famous castaway.

A failed utopia, shut down by a more legitimate nation.