This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

France's most famous cemetery, with some of its most curious tombs.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The oldest stone house in Paris was built by its most famous alchemist.

The world's largest wooden structure.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

This massive blockhead sculpture hides an entire library.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

A contemporary fresco movement illustrates the region's rich history.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

The world’s first museum dedicated to exploring human rights unleashed a wave of controversy.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.