An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

A stately palace has been converted into the world's largest cannabis museum.

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

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

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

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

Paris' fabled purveyor of exotic taxidermy and natural history curios.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Walk in the footsteps of the gods and straddle two tectonic plates.

This downtown Dallas art installation is always on the lookout.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

This collection of reclaimed landmines acts as both an exhibition of their deadly history and as a shelter for children affected by them.

Khmer Rouge's high security prison.

5,000 skulls in memorial to those killed by the Khmer Rouge.

The heads of two giant mythological water horses honor Scotland's horselord past.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Largest lake in Great Britain measured by surface area.