An old California photo stand has been turned into a shrine to the cozy art of crochet.

This outdoor observatory offers stellar views and a scale model of our solar system.

This erect, phallic geological spire wasn't always named so domestically.

An experimental, automotive replica of Stonehenge.

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

An architect's childhood fantasy treehouse made real.

A serene plaza that commemorates one of the Granite State's most iconic figures.

A museum dedicated to exhibiting remarkable outsider art.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

Nondescript elevator doors open to reveal a stunning, surreal world.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

Those belting out show tunes in this West Village piano bar might not realize it marks the site where Thomas Paine died in 1809.

This metal eagle one of the final remnants of a newspaper that wanted to keep Brooklyn to Brooklyn.

This enormous banquet-themed artwork honors over 1,000 notable women throughout history.

A beautiful South Korean gate and garden in Little Rock honors American Taekwondo.

This secluded ruin was once a home for exotic plants.

Here, exhibits come with a side of edible history.

The highest rapid transit station in the world.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

An unusual round church in London with a Templar past.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Cavernous opening completely encased in Karst limestone.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

It’s not hard to see why the historic Peabody Conservatory of Music’s library has been described as a “cathedral of books.”