This museum has a most unusual location: inside a giant, three-headed elephant.

Derelict airplane bodies serve as both home and income for three Thai families.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Week-long block party becomes a competition for the best decorated street.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

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

The largest of London's subterranean rivers and once a mad, bad center of London life.

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