German spire out-leans Pisa

The leaning tower of Bad Frankenhausen in the German state of Thuringia has tilted since at least 1640, and it now leans at an angle of 4.8 degrees -- sharper than the more famous tower in Pisa, Italy, which has only a 3.9 degree slant.

The same salt deposits that give the town's hot springs their healthful mineral-rich waters are slowly eroding from under the tower, making it lean more and more steeply.

The combination of underground salt and underground water means that sinkholes and subsidence are frequent in Bad Frankenhaus. The town council is trying many means to save the tower, but its future is unpredictable.