The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

Friction between grains of sand cause a curious "singing" sound.

An eccentric inventor's castle home with its own indoor weather system.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

This picturesque abandoned home is rumored to be a spite house.

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

A mysterious shape catches the eye in this 16th-century painting.

A quartet of tiled art pieces adorn the floors of this prestigious art museum.

Ancient ruins hidden underneath a modern luxury hotel.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A memorial for public executions that dates back to the 14th century.

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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Hear the quietest sound from across the dome.

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

The curios of pharmacist and collector Henry Wellcome.

At the center of London’s oldest roundabout stands an obelisk that was erected in 1771, but spent several decades elsewhere.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

One part local history, 99 parts gruesome haunted house.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This London marker celebrates the spot where the world-famous English band was founded.