10 most difficult Mexico riddles

Siqueiros was one of the most important muralists of his time. Although Siqueiros and Trótskiy were initially friends, soon they grew apart due to Siqueiros' loyalty to Stalin. The painter banded with an extremist communist group and tried to assassinate Trótskiy in his own house in Mexico City.

The city is ancient - its largest pyramid, the Pyramid of the Sun, was completed by AD 100. It predates most known cultures of Mesoamerica. The origin of its founders is uncertain, and its original name is also unknown. It housed a population of about 150,000 people, making it one of the largest cities in the world at that time.

The Tree of Tule is one of a number of old Montezuma cypress trees that grow in Santa Maria del Tule, Mexico. It is one of the oldest and largest in the world and has the widest girth. It has a height of forty meters, a volume of between 700 and 800m3, an estimated weight of 630 tons and a circumference of about forty meters.The trunk is so wide that thirty people with arms extended joining hands are needed to encircle it.

Rio Grande is the fourth or fifth longest river system in North America, but it flows through arid and desert regions. The average discharge is just 82 m³/s (St Lawrence: 10100, Yukon: 6200, Colorado: 1200). It is also very variable, occasionally rising to over 10000 m³/s or dropping to 1 m³/s. During portions of 2001 and 2002 the mouth of the Rio Grande was blocked by a sandbar.

On 30 April 1863 a small infantry patrol of French Foreign Legion, numbering 62 soldiers and three officers was attacked and besieged by a force that may have eventually reached 3,000 Mexican infantry and cavalry. They made a defensive stand at the nearby Hacienda Camarón, with a plan to occupy Mexican forces to prevent attacks against the nearby French supply convoy. Only two legionnaires survived, but they stopped Mexicans for the whole day and reached their goal.

The modern Xoloitzcuintle appears to be a result of a mixture of the aboriginal, pre-Columbian Xoloitzcuintle, itself a descendant of a domesticated dog that came with the ancestors of indigenous Americans from Asia.

Bjarni was heading to Greenland to visit his father in 986, when he drifted south and found himself near the coast of today Canada. Despite his crew eagerness, he refused to land and only attested the discovery of a land full of trees and hills.

Parícutin is a cinder cone volcano located in the Mexican state of Michoacán, near the city of Uruapan and about 322 kilometers (200 mi) west of Mexico City. The volcano surged suddenly from the cornfield of local farmer Dionisio Pulido in 1943, attracting both popular and scientific attention.

Many words from Nahuatl (like tomato, chocolate, chilli, avocado and coyote) have been borrowed into Spanish, and since diffused into hundreds of other languages. Nahuatl is still spoken in Mexico. You can browse Wikipedia in Nahuatl at http://nah.wikipedia.org/.

The archaeological site of El Tajin, located in the present-day Mexican State of Veracruz, is remarkable for many reasons. The site boasts many buildings, temples, palaces and ball courts, but the most impressive of all is the stunning Pyramid of the Niches. El Tajín was named a World Heritage site in 1992, due to its cultural importance and its architecture.