center is a World Heritage Site Querétaro. The state capital has a beautiful baroque downtown, declared a World Heritage Site. Other popular destinations include the third tallest monolith in the world (Peña de Bernal), a city famous for its thermal springs in the middle of a wine and cheese making area (Tequisquiapan), and astonishing natural and cultural beauties in the biosphere reserve of Sierra Gorda. San Luis Potosí, San Luis Potosí. Rich in ancient times from its mines, this colonial city was the capital of Mexico twice. San Miguel de Allende, Guanajuato. One of Mexico's oldest towns. Many historic churches and the open-air Plaza Allende. An exceptionally beautiful Gothic Cathedral is located here. Taxco, Guerrero. Silver jewelry. A very famous baroque church is located here, its interior is the most admired since the baroque ornamentations are all covered in gold. Tlaxcala, Tlaxcala. The city is the capital of the small state of the same name. It has a noble Arabic "Mudejar" open-air chapel, next to the cathedral. Veracruz, Veracruz. The first City Hall in the Americas was settled here, as well as the historic fort of San Juan de Ulúa. The city was twice occupied by U.S. invaders (1847 and 1914). Zacatecas, Zacatecas. The city was built during colonial Mexico's silver mining boom; its historic center is a UNESCO World Heritage Site. Gallery Ecotourism In Latin America, Costa Rica is considered a model for ecotourism, and Mexico is seeking to develop this sector. Aims for what is considered success in the sector is the proportion of tourist dollars that remain in the locality rather than those outside and prevention of large numbers of ecotourists that could undermine tourists' experience of the natural wonders. Mexico has a significant number of sites designated as UNESCO Biosphere Reserves, some of which are tourist destinations. El Cielo Biosphere Barranca del Cobre Cascada de Texolo Durango El Nevado El Rosario – in the last two months of the year, a mass migration of monarch butterflies reaches the El Rosario sanctuary near Zitácuaro, Michoacán. Isla Mujeres Pinacate Peaks La Bufadora Reserva de la Biosfera El Cielo Sian Ka'an Gulf of California Parque Nacional Sierra de Organos (Sombrerete, Zacatecas) Parque Nacional Sierra San Pedro Mártir Real de Catorce Ría Lagartos Biosphere Reserve, Yucatan Tzararecuita Monarch Butterfly Biosphere Reserve Medical Tourism According to a 2018 survey by the Medical Tourism Association, Mexico is among the top medical destinations