A floating cat sanctuary on an Amsterdam canal.

The medieval "Bearded Man" relief still serves as a clever flood warning marker.

Where the lovelorn find a home for their sentimental keepsakes.

A memorial to the beloved brown bear that served in the Polish army during World War II.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

A Roman spa buried deep beneath the City of London.

A historic presidential getaway on the continental United States' southernmost island.

The museum chronicling a treasure hunter's dream, fulfilled.

"We Seceded Where Others Failed."

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

The highway's southernmost spot is a beloved local attraction.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

A whimsical bridge adorned with decorative dragons.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A public work of art that also provides some relief from the summer heat.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Hidden beneath the streets of London is a secret subway that only carried mail.

An unusual round church in London with a Templar past.

A cluttered and astounding collection of antiquities and curiosities.

London's smallest police station is barely the size of a phone booth.