A luxury hotel constructed out of a former jail.

An art installation commemorates journalist Nellie Bly's undercover reporting inside a New York asylum.

The best bagels in Berlin are tucked away in an independent bookstore.

Superb sweets await at the first Jewish bakery inducted into Berlin’s prestigious baker’s guild.

Hidden in the hills of Western Pennsylvania lies one of the best-kept ghost towns in America that you can legally visit.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

Relive a Polish uprising via an enormous, century-old cyclorama.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

Concerts, art, offices, and a café in what used to be Berlin's first crematorium.

Residents of Berlin take their coffee and cake in one of the city’s most restful spaces: a cemetery.

A slice of central Asia in the middle of Berlin.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A Jenga-style cylindrical tower of books that appears to go on forever.

This doorless 20th-century elevator doesn't stop or slow down.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

Site of the 1889 murder-suicide of crown prince Rudolf and his lover Mary Vetsera.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

Museum devoted to the artificial language of Esperanto.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

This museum is dedicated to the little known ancient Roman history of Vienna.