A reproduction of earth's many biomes.

An off-the-beaten path cave with an underground lake.

Legend says train robbers stashed their gold within the depths of this unusual cave.

America's only nuclear missile silo open to the public.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Eat the ultimate iteration of Portugal's most beloved pastry.

The best place in the world to buy tinned fish.

Sip cherry liqueur at a bar dating back to 1840.

An unassuming music museum recounts the rags to riches story of a dramatic Portuguese genre.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

Commercial airplanes land mere feet over the heads of sunbathing beachgoers on this tiny island.

The highest point in Florida is still the lowest high point in the country.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

In the depths of the Everglades, one man has dedicated his life to studying the elusive Skunk Ape.

A monument celebrating the idea of reaching inaccessible places.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Where manatees are the snowbird vacationers in these balmy Florida springs.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.