This ornate Weser Renaissance house was also the home of an infamous witch hunter.

Over several decades, one of London’s most iconic city gates was dismantled, moved out of the city, and then moved back.

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.

A relic of Poland's shipbuilding past, reborn as a sky-high lookout.

A never-finished memorial to the heroes of the Napoleonic War has become "Scotland's Folly."

This striking, historic hotel has major Wes Anderson movie energy.

Dominating the skyline of Kaliningrad, the iconic House of Soviets has always been abandoned.

According to a satirical conspiracy theory that persists today, this German city of 300,000 is a hoax invented by the CIA.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

The world's biggest floating museum in Gothenburg, Sweden.

An open-air art gallery that aims to share the stories of the people who live around it.

The oldest working camera obscura in the world sits on the top floor of an old windmill tower.

This windmill has been grinding pigments for traditional paints for more than 200 years.

The eyes and ears of this tower keep watch over Malta’s Grand Harbor.

Widely advertised as Amsterdam’s narrowest street, this passage was once a highlight of the Red Light District before its windows closed.

A bike traffic circle showcasing the works of local graffiti artists.

These giant yellow bowling pins seem to be defying gravity.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

A curious collection dedicated to human and animal anatomy and pathology.

A World War II-era sign in Valletta is a reminder of when Malta was besieged so severely that food needed to be rationed.

Pivotal in the research of early British Bronze Age life, found near Stonehenge.

A suburban housing complex with astonishing architectural features, locally nicknamed "the Camemberts."