In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An artsy hidden staircase leads to breathtaking views of San Francisco.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

An urban forest overtakes what was the greatest failure of utopic urban housing.

This is not your typical jungle gym.

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Minnesota's highest point is a scenic vista marked by a plaque and armies of mosquitoes.

Elaborate drama imparts an appreciation for 19th century hardships.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

This taxidermic smorgasbord was co-created by an artist poached from the Museum of Natural History.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

This iconic water tower and failed bandstand is open for panoramic views once a year.

The only arched bridge made of stone on the entire Mississippi River.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

When flour explodes, it's not a pretty sight.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

20,000 pieces in a Frank Gehry-designed building.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.