This massive library holds what was once the largest book collection in the world.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

Saintly bones pressed into a wax effigy of a Catholic superstar.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

This Parisian café sticks almost exclusively to an ethos of reuse.

One of the most comprehensive collections of historic Native American culture in the country reframes artifacts as artwork.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A sculpture of a salmon swimming through a brick building.

Topeka has its own great wall, and it's covered in colorful images from the city's history.

A rainbow-colored house promotes LGBTQ rights across the street from the Westboro Baptist Church.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This playground sculpture of an icon from the past is dedicated to the children of the future.

A giant milk bottle from the 1930s beckons drivers to this diner.

A colorful architectural gem in Seattle's uniquely modern Central Library.

A blacklight mini-golf fever dream pays tribute to the iconic rock band.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The middle finger of modernity.

Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Fortified medieval tower house with lovely roof garden.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.