Artworks by loners, prisoners and the criminally insane.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

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

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

The Guardian of Tallinn.

Visit the monolithic tomb of America's most famous general.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.

Self-sufficient greenhouse floating on the Hudson River.

A jewel of early electric boosterism once again charms Connecticut's historic "Hat City."

This high-perched pachyderm marks the memory of not one, but two elephants gunned down in small New England towns.

This forlorn park is the result of a failed investment turned tax dodge.

The modern birthplace of Irish freedom.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This historic cemetery stopped accepting bodies before many Canadian cities were founded.

The final resting place of 121 victims of the RMS Titanic, 42 of which may never be identified.

Belfast's namesake river still winds below the city center, hidden from sight.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

A museum marks and documents the site of the Titanic's launch.

A morbid piece of memorabilia from the most famous shipwreck in current history is just one of the many poignant artifacts in this Canadian museum's collection.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.