Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Climb inside an iron crystal magnified 165 billion times its normal size.

The first piece of public art dedicated to LGBT rights.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

The most confusing clock in New York.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

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

Home to 23 voluptuous and instantly lovable sculptures by one of Latin America's most celebrated artists.

Two identical statues by Fernando Botero, one blown to pieces in a terrorist bombing, the other donated as a gift for peace.

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

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

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.

This derelict superstructure was a very important warning system for the Soviet military.

One of the most poignant ruins of the Chornobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

This attraction was abandoned after the Chornobyl disaster.