Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Golden Gate Park's historic collection of plants.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

An overlooked and unassuming engineering marvel.

San Francisco's newly reopened hands-on science museum.

The once-abandoned 140-year-old hotel used in the movie "In Dreams."

A museum dedicated to "science, history and the arts" little changed since 1915.

The 100-year-old public collection of a New Hampshire dentist that contains taxidermy, Native American artifacts, and a pair of mummy hands.

Birthplace of America's first documented serial killer.

The massive Roman arch in New Hampshire that was meant to be a tomb.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

The home, museum, and death site of Kodak's influential founder.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

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

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A celebration of capitalism in Midtown.

There must be a pun in this haystack somewhere...

Salute the leader of the proletariat.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A crumbling hospital from the 1850s on Roosevelt Island.

A stone wall that mysteriously moved three feet from its foundation.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.