A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

France's most famous cemetery, with some of its most curious tombs.

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

A brick building in Kathmandu's Durbar Square is home to Nepal's most prominent living goddess.

This hand-built lake system has become a haven for birds.

This park is the prime habitat for Nepal’s Bengal tigers.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

Colombia's biggest botanical garden contains plants from all across the country.

A set of seven houses, each built in a style that represents a European country.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

This subterranean studio is filled with fascinating kinetic art.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

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

The world's only museum devoted to the wonders of fluorescence.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

This abandoned Brutalist treehouse is a hidden architectural relic.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.