A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

For more than 70 years, this small shop has been a go-to for Kolkata's fountain pen connoisseurs and collectors.

These concrete crustaceans are actually public restrooms.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

A mountain range on an active U.S. Navy base hides thousands of mysterious prehistoric rock carvings.

An unexpected and peaceful oasis on a hillside.

At this unique temple in Darjeeling, Hindu and Buddhist practices co-exist harmoniously.

Made of granite, this is a symbol of the Inuit peoples near water that expresses abundance.

Hauntingly beautiful totem poles left by the Haida.

This expansive bridge in the Canadian wilderness was originally just built for friends.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Masonic lodge was the first major private building to be constructed in Washington, D.C. after the Civil War.

Dedicated to the man who created the first radio wave communication system.

The legacy of a wealthy executive and his wife, this little-known art museum features works by Picasso, Monet, Renoir, Cezanne, and more.

The National Park Service’s best-kept secret with views that rival any in D.C.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Go take a picture with the inventor of the daguerreotype photographic process.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

Obscure Freemasons still live in D.C.’s largest private residence.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Largest Roman Catholic church in North America.