The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Museum preserving torture methods from the past.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

Slum Settlement Filled With Mountains of Garbage.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

The first museum in the world devoted to sexual gadgetry.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

Macabre astrological automaton clock dating to the late 1400s.

There are hidden patterns on the subway seats of some Stockholm metro cars.

A statue that stood at the center of a long copyright battle.

This centuries-old rooster survived a devastating fire.

A collection of trees from various corners of the world call Stockholm University home.

A miniature model of the iconic Stockholm department store.

A concrete mushroom that divided Stockholm residents for nearly a century.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

This unique sculpture is often overlooked by pedestrians.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

A Stockholm metro station is home to an escalator that is not only the longest in Sweden, but among the longest in the world.

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

Every Tuesday, students let off steam by screaming into the night air.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.