A late-night restaurant empire was launched from this humble storefront.

This former lieutenant governor's home is brimming with curiosities.

A rapidly disappearing authentic bit of the old south.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

This small shop walked so America could run on Dunkin'.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

The eccentric mansion of one the most popular horror authors of modern times.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The world's largest indoor go-kart racetrack is hiding in Connecticut.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

A wunderkammer hidden on the top floor of the Hartford statehouse.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

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

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Da Vinci's equestrian statue, 500 years in the making.

The enigmatic sculpture hides above an escalator in a Milan metro station.