The world's oldest bookshop still in operation.

This colorful gate stands as an entrance to the walled city of Old San Juan.

Drink wine handed out through a window as part of an age-old tradition.

This building features dozens of faces along its facade, although one is a bit chilling.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

A sanctuary for sickly, stray, or wounded donkeys.

Sip a Negroni Sbagliato in the bar that invented it.

The only museum with its curator—and her pets—buried inside.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Go inside to really appreciate this 500-year-old technological masterpiece.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

This Russian bar-restaurant lies within a three-story underground bathhouse.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Home to items never before seen by the public.

This working class sculpture pounds his hammer all the livelong day.

An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A wall of chewing gum moonlights as collective art.