Stories of sightless fish and ghostly cowboys are only a fraction of the legends surrounding this Kansas sinkhole.

1513 Turkish world map, full of European state secrets and snarky commentary.

Turkish adventurer antiques in the heart of the Grand Bazaar.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

A Parisian boutique devoted to la Sape, the elegant Congolese fashion subculture rooted in European colonization.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

The first green space constructed on an elevated viaduct.

A subterranean shelter remains intact under a busy Paris railway station.

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

France's national museum of scientific and industrial instruments.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Abandoned railway line circling the city of Paris.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Students can borrow artwork from this gallery to display in their own residences.

An ordinary lamppost situated in the middle of Cambridge has an unusual moniker and history.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

The world's oldest family-run magic shop is hidden beneath a bustling London thoroughfare.