An abandoned water sports stadium that has become a haven for graffiti and decay.

The ruins of a creative scholar's fantastical unfinished sanctuary act as his massive gravestone.

A modest reminder of treacherous waters at the Golden Gate.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

A man-made island in scenic San Francisco Bay.

This private residence was the template for one of the most beloved television homes of all time.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A winding path built in secret on the edge of the continent.

An artsy hidden staircase leads to breathtaking views of San Francisco.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

Experience a charming 1930's version of "infotainment."

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

The world's smallest drawbridge.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

On the Hudson resides one of the largest clocks in the world.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.