Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

The final resting place of the great navigator, or maybe his brother.

A marvel of Byzantine engineering under the streets of Istanbul.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

Haven for Cape Fur Seals, until the Ring of Death of jumping Great White Sharks arrives.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Semi-precious Blue John stones have been mined in this cavern system for centuries.