Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

One man's dream has turned into this naturally growing chapel made of almost nothing but trees.

The building features one of the last remaining free-floating spiral grand staircases in the U.S.

The highest bridge in America was built for an almost unnervingly small amount of money.

A 30-foot stack of piano keys memorializes one of the greatest keys players in jazz history.

This small piece of Michigan is entirely surrounded by Ohio.

This life-sized effigy commemorates the dedicated abolitionist and social reformer.

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

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

Cemetery featuring rare glass-fronted columbarium.

Don't get it twisted: This is the oldest pretzel bakery in the United States.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

The only parking meter in the entire town, it is surrounded by 100 free spaces.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

The world's longest bridge fountain has hundreds of nozzles that create a beautiful, illuminated spectacle.

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

Ruins of a historic medical facility sits eerily by the water.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

This abandoned office building is a lasting example of Soviet-era architecture.