Arecibo Observatory. Photo © Frank Van Den Eijnden/123rf.

Sights in Arecibo, Puerto Rico

There are several good reasons to visit the municipality of Arecibo. In the mountainous karst country south of town is the world-famous Observatorio de Arecibo. On the coast is Cueva del Indio, a geographic wonder that illustrates what happens when crashing waves meet massive petrified sand dunes—it’s also a natural repository for petroglyphs. And for children, there’s the Faro de Arecibo Lighthouse and Historical Park with its themed playgrounds and welcoming patch of beach.

You can wander in and out of 14 buildings that make up Fort Mackinac.

Fort Mackinac in Upper Peninsula Michigan

Whitewashed Fort Mackinac is worth a visit for the views alone, presiding over—as forts often do—the downtown, the marina, and Lake Huron. But there’s also plenty of exploring to do at this military outpost with its costumed guides and historic reenactments.

Directional signs in Old Town, San Diego.

Sightseeing Old Town San Diego and Mission Hills

Sightseeing in Old Town San Diego and Mission Hills is a historical and architectural feast. From the city’s first graveyard to a two-century old home and plenty in between, you can easily spend an entire day strolling through San Diego’s history.