More than five miles of underground passageways.

Visit this playground of waterfalls, caves and sinkholes.

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

Amazing pre-Civil War ruins alongside a shallow, rocky river that hosts beautiful (but endangered) lilies.

One of the oldest living oak trees in the Southeast.

This handcrafted, old western-style town is filled with deserted cars, retired movie props, and other forms of Americana.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

Wander through more than 20,000 square feet filled with an amazing collection of orchids.

A folk art mecca famous among outsider art fans.

A psychological self-portrait in the form of a giant, segmented head.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

Garden dedicated to native carnivorous plants and site of huge flytrap heist.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

There's a crumbling old mansion inside the Smithsonian National Zoo.

The national park was once a plantation estate.

A wondrous old library overlooking the nation's capital.

One of the largest collections of Catalan literature and cultural materials outside of Spain, created by a community of 1960s expats.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

This beautiful vintage movie palace has seen little change in form or function since the 1920s.

The only recreation of William Shakespeare's indoor playhouse.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

A small Richmond island dotted with the remnants of hundreds of years of history.