The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Haven for Cape Fur Seals, until the Ring of Death of jumping Great White Sharks arrives.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

The world's tallest aluminum statue is also the world's tallest image of a winged Virgin Mary.

Quito's historic, main square dates back to the 16th century.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

An ancient octagonal weather station named for the eight Greek gods of wind.

Little Red Lighthouse under the George Washington Bridge.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

The oldest continuously-operating Chinese restaurant in the United States has been in business since 1911.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

A diminutive statue that was inspired by the sculptor's own daughter.

The only subway station in the city that still makes use of gap fillers.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

Northern Ireland's Brobdingnagian stepping stones.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.