This city park wants you to take your shoes off.

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

Three hundred illuminated pillars form an “artificial forest” in Medellín.

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

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The largest mural in the world painted by a single artist.

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Unique tower has outlasted a takeover of the company.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

Thousands of jack o'lanterns light up Halloween at this historic West Virginia home.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The location where the iconic movie character declared it was time to go home.

This balancing rock is one of Utah's most unusual geological formations.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

A house carved into a rock in the 1940s.

This quiet park's strange sedimentary spires were named after Kodak's color film.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."