St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Where visitors can play more than 150 retro arcade games.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.

One of the country's largest diving schools set in a picturesque nature reserve.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

Three tiny islands in a Portsmouth pond are at the center of disputed land claims from a number of competing micronations.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

A striking 12th-century-style castle built on the edge of a cliff.

An ancient necropolis of magnificent tombs.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

An incredibly well-preserved piece of ninth-century Viking poop.

The fairy tale castle of the "fairy-tale king."

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Single runway interrupted by a busy road that cuts across its middle.

Red, white, and blue painted steps along with a Union Jack celebrate the outcome of Gibraltar's 1967 referendum.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

A glimpse at Walt Disney's vision for a "community of tomorrow," in miniature.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

Copenhagen's celebrated theme park and gardens.