A 16th-century horror show built in a lovely Italian garden.

Italian director Pier Paolo Pasolini fell in love with this lonely 13th-century tower while making his most famous film.

The largest of Denmark's seven mysterious round churches stands on an island in the Baltic Sea.

This medieval Italian village was transformed into an architectural marvel by the famous "Papessa" Donna Olimpia.

The iconic statue was moved to a new spot overlooking the James river after several years as a mascot for the local baseball team.

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

The ruins of the "20-year town" lay out among the mountains of Alberta.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

This museum has a most unusual location: inside a giant, three-headed elephant.

This colorful colonial neighborhood in Panjim is one of the only Latin Quarters in Asia.

An isolated, rusty phone booth commemorates Iceland's first international telegraph cable.

This desert oddity hides in plain sight thanks to a cartographic error and a desert explorer with a punny sense of humor.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

This magnificent abandoned hotel has long been haunted by its Nazi past.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

It's a pretty creepy lock-up.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

Built to hold the worst of the worst of the Nazi war prisoners.

An abandoned 14th-century castle and prison complex on a small island in the Neva River.