Repository for more than 22 million pickled specimens.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

London's largest outsider art museum.

A historic arboretum and non-conformist, non-denominational park cemetery.

High-end antique collection housed in a centuries-old church.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Hidden beneath the streets of London is a secret subway that only carried mail.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.