Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Olfactory delights in San Francisco's Botanical Gardens.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A speakeasy takes on Chicago's drinking culture.

A beautiful Victorian-era cemetery, complete with a miniature village.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Explore 10 acres of environmental sculptures.

The magic's in the hole!

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

Where beautiful signs live on forever.

A mysterious castle built as a monument to lost love.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A dilapidated dock tells the story of Titanic's missed arrival.

The largest earthwork effigy in the world.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

A natural gas leak provides a flickering flame beneath a waterfall.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

One person's lost luggage is another person's treasure.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.