This modest marker near Notre Dame identifies the very center of Paris.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

Founded as a refugee camp, now a popular tourist spot.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

An eerie collection of the surviving structures from a past celebration of the future.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

A Spanish town built into the cliffs.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

Rare karst landscape eroded from a flat seabed.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

A man's curious and seriously small handmade objects from around the world.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

A totem pole of heads to represent the different stages of life.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.