A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

This private island is still in the family after a 400-year history including a witch hunt and a pirate.

These broken shards of ancient ruin may hide an ancient pyramid.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

Originally built as a promotional giveaway, this suburban house was designed to be an IRL version of the Simpson home.

This monolithic slab of art metal crowns a German slag heap.

This museum chronicles the history of a leprosy quarantine hospital that then became a refuge.

The most metal church of all time was built in record time because of an international, pious pissing contest.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.

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

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

This Connecticut chapel is a starkly modern, and surprisingly colorful, architectural rebel.

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

The final resting place of one of the most sensational guitar players of all time was created only after his father got the rights to his music.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.