Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

A charming Amazigh village carved into a mountaintop.

Red ocher pictographs survive in this tufa rock shelter on the shore of an ancient lake.

"All Mountains - All The Time."

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

One man's unrequited love stands in a glass box forever.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

No one knows why this family’s graves stayed on the national museum's premises after all other tombstones were relocated.

It takes a nine-mile hike to reach these hot springs, but weary hikers are rewarded with stunning views and a warm soak.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

This Alaskan town appoints the general store's resident feline as honorary mayor.

These 7,000-year-old cave paintings depict life in Neolithic Spain.

Dr Barnes' $25 billion private collection of art and arboretum.

Built by the Ancient Greeks, this chariot bridge is still in use today.

This remote camping site offers incredible stargazing opportunities.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

One of the few remaining indigenous petroglyph sites in Nevada.

Many believe these images represent interstellar lifeforms.

Under the right conditions, rocks will move across this dry lakebed, leaving trails behind them.

Former laboratory of radical psychiatrist Wilhelm Reich.

It's safe—and permitted—to walk across these twin natural sandstone arches.

The highest concentration of petroglyph sites in Gold Butte National Monument, plus an improbable early 20th-century dam.

Multiple waterfalls and several historic CCC buildings anchor this state park in Oregon's Willamette Valley.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.