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

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

An enormous, inside-out glass globe built in 1935.

Underground tunnels remain beneath this abandoned mental asylum.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

How did the right arm of a 13th-century English bishop wind up in a Connecticut church?

Ruins of a historic medical facility sits eerily by the water.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

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.