Memorial stone for GWAR vocalist, depicted in his iconic costume.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

A winding district gerrymandered into the shape of a mantis.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Rebuilt remains of a temple to Roman god Mithras.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

A tribute to all the green-thumbed workers who tend London’s public parks and gardens.

Morocco's largest Jewish cemetery.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

This Asian-inspired tower in a lush urban park provides spectacular panoramic views of Baltimore.

This lovely tree was a thank you gift from the man known as "Public Enemy No.1."

An indoor botanical garden for tropical plants looks like a giant cylinder lying on its side.

Fascinating museum dedicated to the under-appreciated medical history of urology features some wince-inducing devices.

These vibrant row houses are a unique example of Baltimore kitsch.

The world's longest known cave system.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

Believe it or not, the now-ubiquitous California avocado originated in Guatemala.