This drowning bronze monument marks the spot where one of Australia's great engineers died by suicide.

A series of sculptures beneath the waves promote ocean conservation and support coral reefs.

This WWII plane died a quiet death, and is now a garden eel playground.

The only way to visit this old resort hotel is with scuba gear.

The haunting peak of an old church is all that remains of a drowned Brazilian city.

This massive swimming pool is the high tech home to the human-powered submarine races.

This protected area in Lake Huron contains some of the world’s best-preserved shipwrecks.

Winter weather reveals a large Italian marble crucifix drowned beneath Lake Michigan.

Six miles off the coast of Key West, a former military transport ship is now one of the largest artificial reefs in the world.

Hidden beneath the waters of Lake Michigan rests a perfectly intact ship from the early 1900s.

Walk down these stairs to get an underwater view of Switzerland's Lake Zug.

Planes, trains, and automobiles have all been sunk as attractions at this Illinois diving spot.

An underwater statue of Christ blesses the depths off Key Largo.

The world's only underwater laboratory where "aquanauts" study oceanic life.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

The 44,000-ton aircraft carrier was purposely sunk to create an artificial reef teeming with life.

A blues musician so talented that people said he must have traded his soul to the devil was born in this house.

The LSU mascot lived on the college campus in one of the most impressive tiger habitats in the country.

This sinkhole was created by a tragic industrial accident and continues to ravage the surrounding landscape.

Away from the crowds of fishing enthusiasts, take a hike deep into the woods and journey into an eerie darkness.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

The seamy, underground secrets of Portland's criminal past.

A sculpture for the sun and stars, created by Nancy Holt.

The only ski tunnel in North America provides easy access to amazing snow and beautiful views.