Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Three hundred years of preserved Spanish colonial history in San Antonio.

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

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

A tribute to Ponce de Leon's supposed quest for eternal youth.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Flashy signs from Las Vegas’s past find their final resting place at this unusual graveyard.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

Kentucky's longest operating jail is now a spooky spot to spend the night.

The history of whiskey and all of its boozy glory, from Colonial days to modern American cocktail culture.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

The ancient latrines of the Greeks, in all their public glory.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

A charming beach town in Turkey captures all the colors of the rainbow.

Dozens of elegant ceramic tiles decorate these ancient walls, each displaying the Lord's Prayer in a different language.

This dome-shaped mountain boasts amazing views and has a rich religious history.

The only quarter of the Old City not dedicated to a major world religion.