Uncover the mystery of the strange, bizarre Toynbee Tiles

As stated above, the heaviest concentration of Toynbee Tiles is in Philadelphia and the surrounding region. If you start at Dilworth Park near City Hall and work your way south, you should run into one at pretty much every intersection. Chestnut Street is especially notable for its numerous tiles... just stroll up the street and spot them as you go.

Boston is the furthest east the tiler ever got, and if you want to spot some of the mysterious messages he left, take a walk around the perimeter of Boston Common. There's one at Temple Place and Tremont Street, one at Charles Street and Beacon Street, and one at Arlington Street and Commonwealth Ave.

If you're in Philadelphia, cruise down I-95 to spot more tiles on your way to Baltimore. There are a bunch in the city's center, around St. Paul Street as it turns into Light Street, and along Lombard Street. You'll also find two outside Camden Yards.

If you're not convinced that the tiler is a mad genius, then seeing the number of tiles he's planted across NYC without getting caught will probably convince you. There are dozens up and down 5th Avenue alone! Walk north or south from the Empire State Building and you'll see what I mean. They're mostly found around Midtown Manhattan... the guy even has one or two in Times Square!

The tiler also has no less than 4 tiles within a few blocks of the White House in Washington DC as well. You'll find most of the DC Toynbee tiles between 15th and 13th streets.

Besides the hundreds of tiles in Philadelphia and one tile in Harrisburg, the only other place to see Toynbee Tiles in Pennsylvania is in Pittsburgh. Two of Steel City's tiles can be found at the edges of Mellon Square: one at Smithfield and 6th, and another at Smithfield and Oliver.

Cleveland also has some Toynbee Tiles-- three, to be exact. One is near Playhouse Square, at 12th and Euclid, another is at West 3rd and Prospect, and the last is at Tower City Center.

There are a few Toynbee Tiles in Detroit, including one across the street from the Michigan Soldiers and Sailors Monument at Bates and Cadillac. Another is a few blocks away, at Randolf and Congress, and two are on Woodward, one at Larned and another across from City Hall.

The tiler also left his mark in Columbus, near Ohio's Statehouse. Head to 3rd and Broad to see the strange message.

If you make your way to Cincinnati's Fountain Square, you'll be super close to two tiles; one is at 5th and Walnut, and the other is a block away at 6th and Walnut. There's also a battered tile at 4th and Main, not too far away.

Indianapolis boasts two Toynbees, both on Meridian Street. One can be found at the intersection with Maryland across from the Hard Rock Cafe, and the other at the street's crossing with Georgia. The first is a more simple design, containing the classic message, while the other is more intricate, with a set of ladies' legs outlining the corners and a little add-on with instructions on making and glueing the tile and a weird message about the media in the USSR.