A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Ornate and macabre headstone in one of the country's oldest cemeteries.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The site of Paul Revere's historic two lantern warning.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

These barriers stand as stark reminders of Northern Ireland's troubled past.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

Go surfing on this urban wave, "hacked" by local surfers.

A fearsome dragon clings to a corner of Munich's city hall.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A fortress off the West coast of Portugal that dates back to 1502.

Amsterdam's Red Light District leaves little to the imagination.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

A public urinal so pretty, it was declared a national monument.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Museum preserving torture methods from the past.