The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

3,000 market stands in five former Zeppelin hangars.

The reconstruction of this prominent building fulfilled a long-written command.

A black cat protests the City Guild in Riga's Old Town.

This poignant art installation raises awareness of violence against women.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

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

The scorched Lisbon church that survived two earthquakes and a massive fire.

Sip cherry liqueur at a bar dating back to 1840.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

This snug medieval lane is one of the narrowest streets in the world.