National Parks in Puerto Rico

San Juan National Historic Site, Puerto Rico

San Juan National Historic Site, Puerto Rico

Photo by: National Park Service

National Park Service

San Juan

National Historic Site, San Juan, PR

The massive fortifications, cannons, dungeons and turrets overlooking the azure Caribbean are a sight to behold, but there’s more hidden underground. A network of “secret” defensive tunnels runs below the fortifications of Castillo San Cristobal, and only two 15-person tours are given every weekend to those who sign up first.

Photo by: By AlbertHerring (Own work) [CC BY-SA 3.0 ], via Wikimedia Commons

By AlbertHerring (Own work) [CC BY-SA 3.0 ], via Wikimedia Commons

Keep Reading

Next Up

National Parks in Virgin Islands

TravelChannel.com takes you on a trip to the national parks in tropical Virgin Islands.

National Parks in Hawaii

Let Travel Channel be your guide as you discover the mythical legends, wartime memorials and stunning, volcanic landscapes that make up Hawaii's National Parks.

National Parks in Florida

Let Travel Channel be your guide as you explore the blue waters and diverse ecosystems abundant in Florida's National Parks.

National Parks in Arizona

See what adventures await in the Grand Canyon State.

National Parks in Nebraska

TravelChannel.com takes you to national parks, trails and monuments in Nebraska.

National Parks in Wyoming

The least populated of the 50 states, Wyoming has room to roam.

National Parks in Louisiana

TravelChannel.com takes you on a southern journey to Louisiana's National Parks.

National Parks in Minnesota

TravelChannel.com shows you the great outdoors and national parks of Minnesota have to offer.

National Parks in Utah

Let Travel Channel be your guide as you explore all that Utah's National Parks have to offer.

National Parks in Oklahoma

TravelChannel.com takes you on a trip to the national parks of Oklahoma.
More from:

Your National Parks

What's New in Interests

Follow Us Everywhere

Join the party! Don't miss Travel Channel in your favorite social media feeds.

Food Network Restaurant Guides

Food Network shares their top places to eat across the country.