A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

This multisensory alley has the ability to remind bustling citygoers to stop and smell the roses.

The site of one of history's most indelible and horrific tragedies.

A park full of outsider art, created by college students studying outsider art.

One man's lifelong obsession with death.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Pennsylvanian mass grave and possibly mass murder.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

Arlington Cemetery exhibit dedicated to death and grieving.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

Huge masonic hall in Philadelphia with lavishly themed rooms.

In the early 1800s, surgery was also a show.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.