A historic Montreal market that was the city's agricultural hub for over century.

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 large circus museum with summer performances.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

The prototype for all Nazi concentration camps.

Go surfing on this urban wave, "hacked" by local surfers.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Handsomely crafted representations of our round planet.

Museum devoted to the artificial language of Esperanto.

The beautiful baroque library of the Hapsburg empire.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

The celebrated eyesore created by starry-eyed sweethearts.

Hungarian self-built castle.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.