Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The final resting place of soldiers' loyal canine companions.

A six-ton wedding present for the King of the Scots.

360° views of the city plus five floors of optical illusions and hands-on science.

A sweet symbol marks the place where torturous executions were once carried out.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

This chimerical bridge/tunnel appears to dead end right into the sea.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The modern birthplace of Irish freedom.

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."

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

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

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

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

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

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