This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

One of the last Jazz Age "Wonder Theaters" in New York City.

Sniff the Titan Arum's rotting flesh.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Mysterious 500-year-old tapestries depict a unicorn hunt.

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

Ride the subways of yesteryear.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

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.

Five candy-colored villages on the Italian Riviera.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This Gothic church houses ornate royal tombs and a magnificent gilded altarpiece.

These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This remarkable museum sprung from one of the most important prehistoric archaeological sites in the world.

A somewhat mysterious biomedical museum housed inside a Spanish university.