For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

A celebration of capitalism in Midtown.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

The only Roman honorific column in Istanbul.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

The eclectic home of a leading Turkish architect is a gorgeous piece of eye candy.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Step back in time and witness the fall of Constantinople.

A sixth-century Byzantine cistern hidden below a modern carpet store.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

Have tea in a cemetery with a dazzling view of Istanbul.

The ornate miniature mansions were built for Istanbul's feathered residents.

Stockholm's deepest subway station is also a stunning ecological wonder.

The district's only illusionarium supports free writing programs for local students with every purchase.

This sublime architectural marvel is a rare example of an expressionist church.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

This building featuring Brutalist architecture has a rich media production history.

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