This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

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

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

Send a postcard while vacationing with Satan.

One kilometer of thick brass rod laid out before your eyes.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.

Pilgrimage site for star-crossed lovers.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A massive sustainable farm designed by the mastermind behind Central Park.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Rusty red sands line the shores of this Canadian Province.

Three prestigious academic collections come together to create a world-class natural history museum.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

There aren't too many operational funiculars around, but Pittsburgh has two!

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

Traditional 15th century Chinese garden in the middle of Vancouver.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.