Yo, Adrian!

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

The mayor made the declaration in 2004.

This playground sculpture of an icon from the past is dedicated to the children of the future.

A giant milk bottle from the 1930s beckons drivers to this diner.

The decorations were inspired by an unlikely missing treasure.

This inanimate goat created by the "welding nun" has been helping to clean up the city of Spokane for more than 40 years.

People come from across the globe to swim in this lake believed to have healing properties.

Site of the greatest known waterfall that ever existed.

This museum remembers the tough Mormon trek across America through an intriguing array of artifacts.

Visitors to this library are in for a real-world education in modernist architecture.

Two stone columns flank the grand Venice square, but there were supposed to be three.

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

The only museum with its curator—and her pets—buried inside.

Immortalized by artists, this church incorporates a medieval lighthouse into its shoreside structure.

This castle-fortress is a living example of the transition from medieval defenses to modern fortifications.

Historic medieval fortified city in southwest France.

Single runway interrupted by a busy road that cuts across its middle.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The fairy tale castle of the "fairy-tale king."