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

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

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

This hospital helped pave the way for treatment that drove down child-mortality rates in 19th and 20th centuries.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

The commemorative stone column conceals a secret laboratory.

An architectural oddity hides in plain sight on this iconic London bridge.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

Historic church where a number of Shakespeare's actors are buried.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

A historic hill of tall tales, with one rather special tree.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

The Tudor-style cottage in the middle of the square is not quite what it seems.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

A recently restored Shoreditch landmark with ties to Jack the Ripper.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

The taxidermied remains of a once-great parrot.

Black cat statues guard this temple-like Egyptian revival factory.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

A friendly pub with a sordid past in cock fighting.

Public access to clean drinking water was an instant hit among the masses.