A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

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

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Singapore's landscaping project is home to 18 incredible Supertrees.

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

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

These 18th century gardens tell a rocky story of the son of Odysseus.

A lush indoor jungle fills this bustling Madrid transportation hub.

Op-art architecture designed for happiness.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

This legendary city has been a tourist attraction for centuries.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Commonly acknowledged as the only public monument to the Devil himself.

Cozy basement bar sports an inventory of over 2,000 beers.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

The prototype for all Nazi concentration camps.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."