Chicago Water Tower

This historical water tower was built in 1869. The second-oldest water tower in the United States. This tower is 55 m tall. One of the few buildings in this area that survived the Great Chicago Fire in 1871.

Chand Baori

One of the most impressive stepwells in India. Built in the 9th century, 13 stories and some 30 meters deep.

Tehuacan stone snakes (tecuates)

Unusual and impressive travertine formations. These formations mark the lime deposits of ancient channels. The soil has weathered away leaving the hardened lime as enormous snakes stretching across the valley. These natural “channels” were used for the irrigation by local people before the coming of Spanish.

Querétaro aqueduct

1,280 m long aqueduct with 75 arches, average height – 23 m. Built in 1726 – 1738.