A striking symbol of the Bulgarian capital.

UNESCO-protected ancient burial ground.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

The medieval network of canals hidden underneath the city is opened to explorers each year.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

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

This strange statue features a bust of the famous composer plopped atop a woman's body.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

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

The only surviving piece of Copenhagen's 16th-century defensive wall.

Copenhagen's celebrated theme park and gardens.

This German fountain of a legendary apple wine-loving drink thief will spit on you.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Macabre astrological automaton clock dating to the late 1400s.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A surreal statue honoring Prague's favorite literary son.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

The signs of a long buried road can still be found hidden beneath a London sewer grate.