An abstract monument to a symphonic composer.

A subterranean house of worship carved right out of the bedrock.

No one knows the meaning behind this giant sculpture of a nude woman with a fork riding a rooster in Havana.

This statue in Plaza San Francisco commemorates a beloved figure from 1950s Havana.

A colossal statue with a controversial past, forgotten for more than 30 years.

A Cuban artist reclaimed his impoverished neighborhood as a dreamy folk art kingdom.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

The Swedish flag over this small naval fort signals that the nation is at peace.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

Stockholm's tiniest statue is of a small boy looking at the Moon.

Stockholm's narrowest alley is barely over two feet wide.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

The modern birthplace of Irish freedom.

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

One of Ireland's most infamous prisons for rebels including men, women and children.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The largest airborne operation in history was launched to capture this bridge.

This large open-air museum showcases the ordinary lives of the people of the Netherlands and pre-industrial crafts and practices.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

The 20-mile causeway that separates the Netherlands from the sea.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Amsterdam's former hotspot for public executions and dissections.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.