The Wonder Road aka Doobie Lane, a mile-long strip of dirt road filled with folk art.

The park is home to the United States's only still-operating Dutch windmill.

The remnants of an early automobile route across shifting sand dunes can still be found in the deserts of Southern California.

This mysterious marker puzzles pedestrians and infuriates geographers.

This spectacular track has run continuously since 1882.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

Florence’s mother built a stairway down to her daughter’s coffin so she could comfort her during storms.

This lesser-known geographic marker was the reference point for all surveys of the continent for 75 years.

This restored house is like a time capsule of the president's unconventional inauguration.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

This natural marble cave is one of only five national monuments in Oregon.

This Old West prison built into the side of a cliff was said to be inescapable.

This historic estate on the east shore of Lake Tahoe was home to an eccentric millionaire (and his pet elephant, Mingo).

The remote resting place of a notorious Wild West outlaw whose death is shrouded in mystery.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

This ancient trail has claimed the lives of over 2,000 people.

This whimsical fountain pays tribute to Toronto's four-legged friends.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

A tribute to one of the most famous cowboys on TV, and the consumerism that fueled his popularity.

A Yiddish theater turned movie house turned rock and roll landmark turned gay disco turned bank.

An unassuming grey box sitting on San Francisco's Pier 17 is a "sky diary" of the coastal city's temperamental weather.

Center filled with hands-on displays served as a tribute to several astronauts with connections to the state.

Weighing 30,000 pounds, this monument represents Detroit's first industrial era.