A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A museum dedicated to the former country.

This small chapel holds the mummified heart of one of the heroes of the Greek Revolution.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

Cannon designed to fire an atomic warhead.

This three-dimensional brick mural is the longest of its kind in the United States.

This 41,000-acre wetland complex is the largest marsh in the interior of the United States.

Step back in time at this 1950s display home, built to showcase once cutting-edge electric amenities.

"Prepare yourself! You are to become the voice of Interplanetary Parliament."

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

Most famous work of one of Frank Lloyd Wright's sons.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

A miniature baseball stadium honoring Johnny Rosenblatt Stadium, home of the College World Series from 1950-2010.

The birthplace of a titan of American cinema.

The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

Palace where the nearly un-killable Rasputin was murdered.

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

A decommissioned Soviet airplane has been used as a movie theater and a cultural center.

Remains of the old fortification along the Western border of the USSR, now an elaborate defense museum.

An overlooked tribute to one of the most important peace deals in American history.

The national park was once a plantation estate.

The eccentric midcentury home of a suspected mafia gun-runner.

An abandoned shopping gallery built during Fascist Italy tucked in the center of Palermo.