A hidden architectural treasure in New York's Brooklyn.

Grottoes, sculptures, and recycled ceramics permeate what was once just a small farm in France.

An icy lake tucked among jaw-dropping alpine panoramas.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

An annual celebration of the infamous, unsolved skyjacking.

This 600-year-old home seems to defy physics.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Despite the groans of archaeologists, this astounding groups of Bronze Age petroglyphs have been painted red for tourists.

A historic Montreal market that was the city's agricultural hub for over century.

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

This lovely ancestral home inspired the author D.H. Lawrence, and features a tunnel made out of a living willow.

New England's "Witches of Eastwick" locations, in all of their quaint white churched glory.

This enchanting Victorian estate was home to the world's first hydroelectric power generator.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

Over 50 historic windmills whir away at this outdoor museum.

Working compound meant to allow visitors to reclaim the values and traditions of the past.

1898 German railroad depot museum with working engines, steam train excursions, and hands-on displays.

15,000 year old bison sculptures.

The highest point in Montana is as rugged and singular as the state itself.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

Experience the life of an 1800's lumberjack at this interactive museum that is only accessible by railroad.

Marvel of green building techniques that sings with the wind.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.