An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

A lush indoor jungle fills this bustling Madrid transportation hub.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Bacteria and algae give the salty water its bubblegum hue.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Breathtaking Byzantine paintings cover the inside of this 12th-century church.

An ethereal glowing blue ocean cave in Croatia.

The walls of this medieval church are covered with perfectly preserved frescos, including a pristine example of the Dance of Death.

This massive subterranean fissure is known as the "underground Grand Canyon."

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

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

Ancient snack bar of the Roman Empire re-opened.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

A forgotten "city of water" underneath the famous Trevi district.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

A butcher shop in Minneapolis has all the meats and cheeses you’d expect from any of its kind—except that all the products are vegan.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

The glowing blue Nymphaeum of Emperor Tiberius.

Pompeii's less famous neighbor is still revealing her secrets.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

2300-year-old Roman road connecting the empire.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.