A museum in the former home of Marxist revolutionary Leon Trotsky.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

An Orwellian sculpture with eyeball cameras watches passersby.

This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

Hans Christian Andersen for the postmodern world.

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

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The house where a Danish physicist discovered the connection between electricity and magnetism.

Site of the first radio and telephone broadcasting companies in Copenhagen.

Copenhagen's celebrated theme park and gardens.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

The cutest way to stay safe in traffic.

Atop this former dutch railway office sits an interstellar work of art.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

A typographic tribute to the many comedic greats who make Great Britain laugh.

A stretch of land where the sour-sweet vegetable is cloaked in darkness and grows so fast you can hear it crack, squeak, and pop.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

Spain's largest bullring offers a unique glimpse at architecture and history.

This bronze statue stands throughout the year and illustrates an urgent message about the environment.