
Puerto Rico at a glance
Puerto Rico is the smallest of the Greater Antilles and a territory of the United States. Old San Juan is its heart: blue cobblestone streets, brightly painted colonial houses, and the huge fortresses of El Morro and San Cristóbal guarding the harbor.
An hour east, El Yunque National Forest is the only tropical rainforest in the US National Forest system, full of waterfalls and the call of the tiny coquí frog. Puerto Rico also has three bioluminescent bays, where the water glows blue when you move through it at night. Mosquito Bay on the island of Vieques is considered one of the brightest in the world.
Photo: Nils Huenerfuerst via Wikimedia Commons, CC BY 4.0

