An unusual and beautiful form of mass transit serves the city's steepest neighborhoods.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

In the heart of Medellín, an artsy urban complex sets the stage for demonstrations and protests.

A sprawling network of century-old subterranean catacombs lies beneath a nondescript suburban home.

Memorial to the 137 lives lost on a ship fire, the whole hulk of which washed up on the Asbury Park shore.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

A wooden theatre that remains the heart of a charming Victorian-era New Jersey enclave.

Still standing despite its considerable slant, this tilted lighthouse has become a local symbol of resilience.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

In the middle of this historic colonial city resides a modernist government building known as the UFO.

The walls of a colonial-era fort encircle a small, tropical assortment of plant life.

Iconic red and white plaques show the creative names invented to navigate the city streets.

Its sunny hues are believed to have inspired the town's color palette.

This one-of-a-kind convent boasts a kaleidoscopic exterior of stars and double-headed eagles.

New Zealand's only running funicular railway.

The world's only complete colossal squid specimen is on display at the Te Papa Museum.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The world's largest military aircraft cemetery.

The remains of this rugged homestead ranch offer a brief glimpse into a bygone era.

Spanish religion mixed with local architecture has yielded a network of churches unlike any other.