A decommissioned military complex that's now a modern industrial park.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

A jewel of the Mexico city skyline now slowly crumbles after surviving an earthquake.

Explore the atmospheric ruins of an abandoned convent in the dense forests of Mexico's first national park.

66,000 pieces of art, donated by one of the world's richest men.

This fairytale-like structure is the last turf church ever constructed in Iceland.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

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

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

Cryptic messages embedded in the New York City sidewalk.

Avoid gangster interaction while window-shopping.

A hidden "place of interment for gentlemen."

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

Discarded animal sculptures stand forgotten by an abandoned aquarium and water park in Bosque de Chapultepec.

Walk into the 19th century without leaving Brooklyn.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.