The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

This hands-on math museum believes in turning concepts into constructs.

The largest collection of two headed animals in the world.

Pay your respects to departed pets, both celebrity and otherwise.

The decor of this Hollywood movie palace just barely predated the opening of King Tut's tomb.

Instead of hoofing it up steep stairs, residents can hitch a ride on this private lift.

A master of deception, Harry Houdini's greatest trick may have been living in two places at once.

This symbol of peace is appropriately positioned overlooking the Pacific Ocean.

Because there's no place like home.

An L.A. traffic island where the faces of locals have been carved into massive granite eggs.

L.A.'s oldest operating bowling alley is a beautifully restored homage to its speakeasy days.

This forgotten Frank Lloyd Wright house is an architectural marvel at the end of a sleepy residential street.

Puerto Rico's once thriving oil company is now an abandoned wonderland of rusty steel.

This memorial to a family's dead son has survived a century of hurricanes and earthquakes.

This ''hidden'' 19th-century bridge played a simple, yet important role during the Spanish-American War.

Puerto Rico's oldest rum producer started its 140-year-old business with "a little barrel."

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

This giant bronze image of Christopher Columbus embarked on a voyage of its own.

This small fort played a huge role defending Puerto Rico’s capital city.

What began with a single, 357-pound chunk of the Canyon Diablo meteorite grew to be an impressive collection. 

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

The ruins of the first Spanish settlement in Puerto Rico.

A quirky collection of figurines backdropped by city views is hidden next to a popular restaurant in the Hollywood hills.