Perched atop the highest hill in Cartagena, this 17th-century convent offers spectacular views of the city.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

Located outside Medellín, this Colombian park focuses on conservation and sustainability.

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.

It's not quite as old as its Roman appearance suggests, but this piece of infrastructure served Guatemala City for centuries.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

This blue behemoth of a bear is a colorful homage to Brown University's mascot.

One of the oldest carousels in the United States is still running in the coastal village of Watch Hill.

The place where Samuel "Slater the Traitor" brought the Industrial Revolution to America.

Ironically this massive termite is the mascot for a company that is acclaimed for killing his kind.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

An architecturally unique lighthouse that had to be lifted up and moved to avoid falling in the sea.

A giant green dragon crawls down from the roof of the Providence Children's Museum.

Eco-friendly island mansion.

The only surviving fragment of the lost Narragansett Pier Casino.

A 60-room castle constructed by a horse-racing heir.

This lighthouse was witness to the end of WWII hostilities and now collects creepy cairns.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.