Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Cliffs full of fossils at the portal to England's Jurassic Coast.

The ancient latrines of the Greeks, in all their public glory.

Breathtaking and huge 430 year old maps of Italy.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Singapore's landscaping project is home to 18 incredible Supertrees.

A white Buddhist temple with a golden restroom.

Cold war icon and onetime "hole" in the iron curtain.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Metro station with a claim to rock n' roll fame.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

Khmer Rouge's high security prison.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.

Self-mummified monk who wears sunglasses and has become a gecko hatchery.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.