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

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

The world's tallest palm trees look like the whimsical kind of plant you'd find in a Dr. Seuss story.

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

This tiny shop has been serving traditional tamales for more than 200 years.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

The Andean town where every single building is decorated with a brightly colored frieze.

An old spa town in the mountains of Romania where, according to legend, the great hero Hercules once bathed.

Romania's triumphal arch looks out over Bucharest.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This snug medieval lane is one of the narrowest streets in the world.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

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

Two buildings named after their windows that make it look like a sea of television sets plastered to a wall.

This feat of Brutalist architecture is also known as the Three Sisters.

This statue of the famed author, actor, and journalist is made entirely of screw-nuts.

The unusual sculptures are believed to be powerful political symbols.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

Abstract monuments express sorrow and resilience at the site of a horrific massacre in Nazi-occupied Serbia.

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A pair of connected skyscrapers form this symbolic gateway.