A monument to the love people have for their pets.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Visible below the waves are memorials to the city's Gold Rush dead.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Its buzzing collection honors vibrator history.

A house built from trash known as the poor man's Hearst Castle.

A preserved oasis with traditional Andalusian-style architecture and beautiful views of the Nile.

Hundreds of thousands of ancient documents offer a unique glimpse into Jewish life in Cairo.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

An endless sea of white conical domes.

A massive work of modern art that appears to be a crop circle in the middle of the desert.

Egyptian treasure trove of fossils documenting the whale's transition from land mammal to sea creature.

It might not be the prettiest pyramid in Egypt, but it may be the muddiest.

These Nubian pyramids are strange and unique, even by pyramid standards.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

America's most famous piece of self-built architecture.

Quite simply the largest tree in the world (by volume).

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

The biggest pinball arcade in the world has over 600 pinball machines, and 300 arcade machines.

Abandoned bridge hidden deep in the San Gabriel Mountains.

A music-filled, booze-soaked oasis in the desert.

Abandoned Air Force base that has fallen into disrepair.