The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

A self-built castle made by a mysterious man.

The largest self-built castle in the U.S., six decades in the making.

A home covered with elaborate mosaic and other pieces of art.

One man's ambition created this psychedelic log home.

Malaysia's first interactive museum.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

A home made entirely from scrapped, reclaimed and recycled material in Whitman County, Washington.

Along the old Route 66 is an abandoned trading post made from old telephone poles, built by a former circus clown.

An entire town preserved as a historic landmark.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

An architect's childhood fantasy treehouse made real.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

This abandoned train tunnel has been the subject of countless ghost stories for years.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This pop-culture shop also offers the chance to become part of their favorite tv show or movie.

Jail from the 19th century that was built by inmates.

This underground cave located in the most barren reaches of Idaho is filled with ice year-round.

A fiery crater has been burning in the Karakum Desert since 1971.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

A new kind of theme park for adults off the Las Vegas Strip.

This former open-pit manganese mine is now a massive graffiti canvas.