For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

This tiny cafe is one of the last meeting places of its kind, allowing revolutionaries a place to plot.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

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

The secret cells in the basement of the KGB's Estonian "Grey House" have been preserved as a grim Cold War museum.

Stalin's prisoner-built rail line sits in ruin, never having a single car ride its tracks.

Now abandoned, this East Austin school for the disabled began as the "State Colony for the Feeble-minded."

Hub of Scandinavian culture in a Minneapolis deli.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

This historic Canadian jail was once the longest operating prison in the country and is now open for people to incarcerate themselves.

This memorial to a horrific ship collision sits over a mass grave holding dozens of the victims.

This artful dam holds back a crater-made reservoir that can be seen from space.

Despite its name this unique art piece was established to commemorate a tragic flood.

An abandoned town centered around a paper mill powered by a large waterfall.

Tour the sci-fi-esque reality of governmental disease management.

The terrified face of Henry Wells is etched on this garret window.

Shaped like a big top tent, this memorial honors the victims of a terrible train wreck.

Made of giant chains and hung with shackles, this iron cross honors those unknowns who perished under American slavery.