The short hike is worth the stunning views and crystal blue waters of a secluded beach.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

Where visitors can play more than 150 retro arcade games.

If it wasn’t for a real estate agent with a penchant for old-school arcades, this hands-on collection of nostalgic flipper machines might never exist.

Oklahoma City's oldest arcade has reinvented itself as a competitive pinball mecca.

This childhood throwback has hundreds of arcade games and pinball machines to transport you back in time.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

Two dozen pinball games hidden away inside a most unlikely location.

House built with over 60,000 glass bottles.

This rock in the middle of a river in Jayuya contains dozens of Pre-Columbian Taíno petroglyphs.

Enjoy the waters of this half-moon-shaped natural pool surrounded by breathtaking scenery.

This beachside town is home to a diverse nature reserve, multiple cays, and one of the three bioluminescent bays in Puerto Rico.

A natural swimming pool in the middle of the Carite Forest.

Drift through underground caves on a tube.

On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

This tiny home was originally a narrow alleyway.

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

This small primate research island is teeming with playing, fighting wild monkeys.

The world's brightest bioluminescent bay.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

The last used bookstore in Downtown San Francisco is one of the smallest bookstores just about anywhere.

The first fresco Diego Rivera painted in the United States can be found in the former San Francisco Stock Exchange.