This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

Ornate limestone building now filled with geologic specimens, and more.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A man has revenged his true love's betrayal through tears and stone genitalia.

A mechanized clock where a man fights off a dragon, crab, and rooster.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Towering basalt columns, a creation of fire and ice.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The fairy tale castle of the "fairy-tale king."

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

Free public park and gardens filled with peacocks and peahens.

This failed condo development was reborn as a street art hub.

One part antique store, one part curiosities hodge-podge.

Continuing the tradition of the dime museum in style.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

Neoclassical bank designed by NY architects Helmle & Huberty.

A semi-scholarly approach to sex.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Underground tunnels remain beneath this abandoned mental asylum.

The author of Uncle Tom's Cabin was neighbors with Mark Twain while living in this Connecticut home.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.