A preserved 18th century steel factory.

When flour explodes, it's not a pretty sight.

This witch statue remembers a time in England's history when fear trumped truth.

Go inside to really appreciate this 500-year-old technological masterpiece.

An underground city of salt.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

A small church ornamented with medieval erotic sculptures.

The world's first electric battery-powered submarine.

80 years of the Battle of Peasholm on a small English lake.

Salaguti's live-in museum: a fortress against criticism and consumer art.

Stunning Roman aqueduct used for 1900 years and still standing.

Massive galleon from a box-office bomb docked in Genoa.

65 million-year-old chalk outcroppings mark the end of the Jurassic Coast.

Walk through a fairytale in Tuscany.

Enter the Forest of the Elves.

A Foundry on a Sleepy Street.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

These curious caverns have been home to mushrooms, gangsters, and disco.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.

A fence constructed completely of skis on Monroe Street.

The only arched bridge made of stone on the entire Mississippi River.

The oldest remaining frame residence in Minneapolis.

The Real LegoLand.