An incarceration museum on the spot of possibly the oldest prison in England.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This tiny lake temple dedicated to a water goddess seems to float on the surface.

France's most famous cemetery, with some of its most curious tombs.

A six-ton wedding present for the King of the Scots.

The final resting place of soldiers' loyal canine companions.

This stunning concert hall has become a symbol of Iceland's national recovery.

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

This fairytale-like structure is the last turf church ever constructed in Iceland.

Three columns of volcanic rock shoot out of the ocean.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

This spot in St. Louis, marked with a simple sign, has seen more pro baseball than just about anywhere else in the world.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

This Western Australian mint was established during the height of the Australian gold rush.