A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A once-secret library of Freemason history in Catalonia.

Longest canal tunnel in the world, abandoned in the 1960s.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

An eerie, little-known Neapolitan museum filled with preserved human remains.

Massive galleon from a box-office bomb docked in Genoa.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

A devastating booze inferno poured through the streets, claiming several victims who drank it.

Though they've since been renamed, these two streets hint at Dublin's darker days.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

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

The modern birthplace of Irish freedom.

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

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

The burial place of 14 of the executed leaders of the Easter Rising.

A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

Clusters of abandoned buildings hint at the facility's 144-year history with psychiatric health.

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

The tiny church offers succor to travelers driving by, but only eight at a time.

Take a sea tractor to the Art Deco hotel on the island that inspired Agatha Christie.

Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.