A hand-built folk art installation covered with messages of God's love.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

This memorial honors five journalists who were killed in a mass shooting in 2018, and affirms the importance of the first amendment.

The oldest military monument in the United States.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

The National Park Service’s best-kept secret with views that rival any in D.C.

The location where the American Revolution ended.

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

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

The ruins of the first Spanish settlement in Puerto Rico.

Archaeological sites and great food inside the island's largest mangrove forest.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

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

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

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This colorful gate stands as an entrance to the walled city of Old San Juan.

This tiny home was originally a narrow alleyway.

Once damaged by Hurricane Agnes, this bridge is now on the National Register of Historic Places.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

This local mascot has been a presence in the area since the 1960s.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

The phrase "the shot heard around the world" was coined after a skirmish at this bridge.

The unique location where the former president was rapidly sworn in.

A historic Maryland home that once belonged to a man who has been called "the most insignificant" U.S. Supreme Court justice.