A historic lighthouse steeped in rumors of ghost and pirate stories.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

Once the center of food production for this small town.

A fire station-turned-church-turned-museum dedicated to the work of seminal light artist Dan Flavin.

This backwater graveyard in the Hamptons became a trendy burial spot and posthumous status symbol for famous artists.

A mysterious air force base built to resemble a Long Island fishing village.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

A stone wall that mysteriously moved three feet from its foundation.

The home of Ireland's last leprechauns is officially protected by the European Union.

These engineering masterpieces are a dominant feature of the Belfast skyline.

A museum marks and documents the site of the Titanic's launch.

One of the largest lenses of its kind ever created, this former ship beacon has been brought down to Earth.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

Enigmatic bug-like sculptures mystify drivers along a Swedish highway.

This former peat factory was transformed into an observatory before being abandoned once again.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

This unique architectural wonder is home to luxury apartments.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

This Danish art forest places loud works of contemporary art among the pensive silence of nature.

This huge industrial sculpture looks like a UFO and a factory had a baby.