This neoclassic cathedral also houses what is believed to be the oldest clock in the Americas.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Believed to be haunted, this old cemetery is beautifully adorned with Spanish moss hanging from the trees.

This historic oak tree has been around for over 300 years and might last for 300 more so long as it doesn't fall apart first.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

This Florida museum dedicated to western artwork is entered through an artificial canyon with imported sandstone.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

The humble home where the famous beat author lived briefly and wrote one of his most famous works.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

World's largest bell sits on the grounds of the Kremlin in Moscow.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

Macabre astrological automaton clock dating to the late 1400s.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A haunted hill that supposedly defied gravity.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Town of spiritualists and mediums in Florida.

A mega theme park-wax museum mélange containing all things biblical.