This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

"There's nothing there," and other lies the KGB told us.

A subterranean house of worship carved right out of the bedrock.

An alien church provides much needed silence in the midst of a Finland shopping center.

Finland's oldest astronomical observatory once played a crucial role in seafaring and timekeeping.

A lovingly curated curio shop in which the taxidermy wear newspaper party hats, and peanut shells are spread across every surface.

Ancient mysterious ruts carved in the bedrock.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

Ship skeletons haunt Baltimore's waterways.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

Once America's tallest structure, now a Baltimore landmark.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The trials and tribulations of marking Poe's grave.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

Eighteen miniature death-scene dioramas.

A model home in the Medical Examiner's Office in which grisly death scenes are staged to train forensic investigators.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.