Florence’s mother built a stairway down to her daughter’s coffin so she could comfort her during storms.

An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

An abandoned castle owned and ignored by Masons carries a cursed history.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

A once grand hotel is being retaken by the wilderness it once capitalized on.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

A hands-on traveling collection of the innovative devices of yesteryear.

The top of society once luxuriated in this world-class hotel, which continues to impress, even in ruin.

Japan's largest collection of Western-style mansions in the port city of Kobe includes a recreation of Sherlock Holmes' 221B Baker Street quarters.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The oldest stone house in Paris was built by its most famous alchemist.

This series of Scottish caves has no clear purpose other than baffling historians.

360° views of the city plus five floors of optical illusions and hands-on science.

A legendary speakeasy bookstore returns from the brink.

A gargantuan crystal kingdom.

The ghostly remains of an accidental sea.

This structure among the trees was the result of divine inspiration.

The world's largest collection of witchcraft regalia.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Medicinal spa created with the discharge from a geothermal energy plant.

An exquisite tunnel of cascading flowers.