An apparition of Virgin Mary in Herzegovina.

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

Bridge that died in war and was resurected.

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

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

Longest fortress system anywhere in Europe.

This picturesque medieval monastery guards a small trove of historic treasures.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

Some believe Ponce de León's mystical spring lurks right under a public drinking fountain.

This natural spring is the winter home to the largest gathering of manatees in the world.

A historic presidential getaway on the continental United States' southernmost island.

The giant squid's 27-foot-long corpse lies preserved within a Sarasota aquarium.

A circus legend leaves an unexpected endowment.

A luxuriant botanical garden below sea level.

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

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The first declared National Monument in the United States.

Eight "Guardians of Health" protect this art deco water tower from pollutants and bacteria.

The only arched bridge made of stone on the entire Mississippi River.