A menagerie of concrete animals brought together from across New York City's parks.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

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

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

A modern mechanical planetary system, part of a 10,000 year clock.

Admire a Lilliputian replica of the fast food outlet.

Luminaries of all stripes have sipped strong Greek coffee at this cafe since 1839.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This coffee shop lies hidden beneath a historic church.

This pub can leave even the sober feeling slightly unsteady.

Pick up a kebab and a credenza at this unique combination furniture store and café.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

Discover the taste of mold.

Nikola Tesla's former home contains an homage hidden from plain sight.

Tear apart fatty, gently charred lamb chops with your bare hands.

Since 1969, this restaurant has served up dishes typical of Istanbul's Greek diaspora.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

These caves secretly held national treasures during World War II.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

Gladiators once walked this ancient, subterranean passage.