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

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

This enigmatic artifact remained buried in a churchyard for years.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

The oldest housing complex in Riga is a mini timeline of architectural trends.

A black cat protests the City Guild in Riga's Old Town.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

These medieval tunnels provided water to the city above through centuries of civil war and plague.

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

The little-known second castle that William the Conqueror built in York.

The phone booths in this English town have distinctly milky hues.

This unassuming building produced some of the world's most famous bells.

The medieval woodcut-style artwork chronicles life in medieval London.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

This East End pub gained notoriety as the site where gangster Ronnie Kray publicly shot a rival.

This lush area was the site of extensive enemy bombing during WWII.

The vaulted ceiling is home to a scurry of “squirrelgoyles.”

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

Where condemned pirates met their grisly end at the gallows on the River Thames.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

The Columbia Road Flower Market is now open every Sunday, rain or shine.