This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A wunderkammer of mysterious objects and stories.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A surreal museum of extraordinary industrial objects.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

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

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

A remarkably intact castle that once was the largest in Ireland.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

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."

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.