The abandoned remains of a once popular zoo, and the grave of the last known Tasmanian Tiger.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

To literally keep their waste out of their own backyards, the citizens of this English city built an impressive sewer system that is still in use today.

The premier place to experience the Victorian imagining of the steam-powered future.

The explorer Captain Cook may have named it White Island, but the Maori call it Te Puia o Whakaari – The Dramatic Volcano.

The final resting place of the poets Shelley and Keats.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.