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Madrid's very own ultramodern twin version of the Leaning Tower of Pisa, this pair of highly controversial gravity-defying torres was built at the beginning of the booming '80s to symbolize a new economic dawn. Financed by the Kuwaiti Investment Office (hence the name), their completion was delayed well over a decade due to a financial scandal. Evocative icons of smoked glass and concrete, they stand at the northern end of the Castellana Avenue on either side of Plaza Castilla like jet-age exit gates to the city, though their once uniquely dominant presence has now been eclipsed by the four huge CBTA towers farther up the avenue.