This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Walk over a 150 year old manhole.

From scholastic to sepulchral - now under reconstruction.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Elevated freight railway turned wildly successful urban park.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

Huge stone depressions which may have acted as an Incan agricultural experiment.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A beautiful deserted greenhouse in the middle of a park.

What was once a unique system of urban elevators is turning into a mechanical ruin.

Built for the 1962 World Cup, this fully functioning botanical clock is still ticking.