Playa del Amor, Marietas Islands, Mexico © ferrantraite/Getty Images

This gorgeous shot was taken at Playa del Amor—aka Hidden Beach—a remote destination off the coast of Puerto Vallarta, Mexico, known for its pristine beauty. To get to it, visitors need to take a boat toward the mouth of Banderas Bay at the base of the Marietas Islands. Once there, they swim through a tunnel at low tide to reach the beach. The walls hide a sandy cove, where the turquoise waters contrast with flora-laden cliffs that perfectly frame the blue sky overhead. Playa del Amor (Lovers" Beach) is popular among tourists, but the number of visitors is limited to preserve its natural beauty and ecosystem.