These mysterious petroglyphs in Vermont reflect a troubled history in the treatment of Native American culture.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The world's longest known cave system.

Today this bizarre rooftop phone booth seems like a piece of kitsch but it was once used to spot disastrous storms.

The highest point in Texas is capped by a big silver pyramid.

Springtime is go time for this repurposed shack and the fish it venerates.

A human attendant once directed car traffic from this structure before automated stoplights.

This petite park lets visitors see and touch examples of fossilized dinosaur tracks.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

Legends surround this jagged rock formation in the New Mexico desert.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Site of the greatest known waterfall that ever existed.

A whimsical village of unique treehouses resides in a Washington forest.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

In northern Ohio, the glorious past of America's trains is on full display.

Where the Model T was made and the assembly line was invented.

Astounding collection of coin-operated games and automata.

World's largest Christmas store.

This indie movie theater is one of only three surviving Mayan-themed theaters designed by “Detroit’s greatest theater architect.”

One man’s vision of living among dinosaurs credits Jesus Christ as the engine of biological evolution.

Largest outdoor staircase in the United States.

A mysterious light in the wood, rumoured to be the the ghost of a railroad brakeman.