Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

Breathtaking and huge 430 year old maps of Italy.

A seaside town with no sea in sight.

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

A tongue-in-cheek arcade where the games are based on everyday life.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

One of the only single-person private gravesites in New York City.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

A reminder to choose water over wine since 1888.

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

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

Only a fragment of this 15th-century Dance of Death survives today.

This magnificently macabre shield shows the power of chivalrous love in medieval times.

One of the few surviving examples of Victorian-era public toilets now houses a small homestay.

These carved, weathered stones once gave mail carriers and pub goers a leg up.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.