An unnatural lake in a naturally beautiful setting.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

The abandoned remains of this once-thriving hotel looms over the city, awaiting an uncertain future.

Puerto Rico's oldest rum producer started its 140-year-old business with "a little barrel."

A portrait of the Charter Oak hangs in a frame made from the Charter Oak.

The author of Uncle Tom's Cabin was neighbors with Mark Twain while living in this Connecticut home.

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

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

The childhood home of the meat inspector who would become the face of America.

This petite park lets visitors see and touch examples of fossilized dinosaur tracks.

This 15th-century church houses priceless works of art from a range of Croatian artists.

Inside this mansion turned museum, the works of prominent Croatian artists are on full display.

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.

An ancient knight and a symbol of the city's freedom.

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

Longest fortress system anywhere in Europe.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

Gargoyle head that brings good luck.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.