The oldest remaining theatre in New South Wales.

An Australian lake whose pink hue defies scientific explanation.

The former home of the "Mother of Father's Day."

Train debris from the deadliest avalanche in United States history can still be found in the ravine where so many perished.

A heartfelt tribute to all of the victims of one of the greatest tragedies in United States history.

People come from across the globe to swim in this lake believed to have healing properties.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

An inconspicuous footbridge beloved by San Diego locals.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

One of the most accessible undersea plane wrecks in the world.

In paradise, feral pigs have claimed an island all to themselves.

An important Mayan religious and trading center dating back to 200 BC.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

An early 20th-century bullring converted into a modern shopping center.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

London's smallest police station is barely the size of a phone booth.

The Italian revolutionary's legendary wife is portrayed on horseback waving a gun and holding her child in this memorial on the Janiculum.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

This bridge was constructed from the rubble of the infamous Bastille.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.