Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

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

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

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

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

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

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

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

A favorite with sightseers and locals alike, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

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

This 47-story "M" needed 20 years to be completed

Just like in Hollywood, Madrid has also a forgotten walk of fame.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This elegant arc of a waterfall marks a religious turning point.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

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

See where Bill Murray kidnapped a hapless Punxsutawney Phil.