This legendary city has been a tourist attraction for centuries.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Monasteries on rock pillars, once accessible only by frayed ropes.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

One of the deepest blue holes in the world.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

A turquoise lake within a volcanic crater.

A swing to dangle you off the very edge.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

The highest tropical mountain range in the world is in Central Peru, home to a vast array of exotic and quirky plants and animals.

Extraordinary rock formations in open Peruvian fields.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

The world's largest clay lick, where parrots gather to snack.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

This red lake 4,000 meters above sea level is home to rare flamingos.

The deepest hole drilled in the name of science, where evidence of Precambrian life was found.

A monument to the defenders of the Arctic in Murmansk, Russia.

A little church on a tiny island looks like something from a fairy tale.

The place to be if you love vintage Swedish cars.

Preserved "bog person" that is over 2,000 years old.

Four alabaster giants contemplate the tides on the shore of Denmark.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

The gargoyles and grotesques of the 21st century are here—22 emoji built into a new building in the Netherlands.