Seaside ruins of a settlement that date back to the first century B.C.

This portrait of Philip V is always hung upside down, in a protest three centuries in the making.

The Home and murder site of the witch of Rehmeyers Hollow.

New York City's only radical feminist independent bookstore.

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

Little Red Lighthouse under the George Washington Bridge.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

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

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

A large boulder marks the place where the island of Manhattan was purportedly "sold" to the Dutch.

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

The mummified relics of an American missionary.

The highest point on the island known for buildings that touch the sky.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

This enormous censer uses a pulley system installed over 400 years ago.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.