At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

A piece of the front end of a British cruiser that was used as a block ship in World War I.

This small chapel built into rock is the oldest place of worship in Luxembourg.

Pull up and have a drink at a museum filled with hundreds of years' worth of shipwreck artifacts.

This may be the world's only drive-through windmill.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

The remnants of an abandoned, 19th-century gold mill along Aruba's rugged northeastern coast.

Underground attraction offering tours of the foundational ruins of a church nave that collapsed in 1674.

The cutest way to stay safe in traffic.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

This sculpture of disembodied body parts forms a poignant memory of the horrors of World War II.

Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.

This monument is dedicated to a young boy who survived a disaster that forced Edinburgh to reevaluate its building codes.

The most loyal of little dogs, or a Victorian era publicity stunt?