One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

A flooded Mexican cave that hides a river beneath the water.

This natural wonder is disappearing at an alarming rate.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

This stone complex marks the urban center of a lost civilization.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A bright little alley in La Boca is a part of tango history.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

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

This one-time health resort was used by aristocrats around the world.

A little sculpture with a large wardrobe.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

2300-year-old Roman road connecting the empire.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

A hugely vast Irish landscape of barren rock that stretches for miles.

An ancient neolithic tomb that only sees the sun twice a year.

The ancient tomb acts as a calendar that keeps perfect time.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This ancient theater was once the home of fierce gladiatorial battles.