57100
Almost immediately following the arrival of railroads beginning in 1871 , the city 's location at the base of Pikes Peak and the Rocky Mountains made it a popular tourism destination .
 Pikes Peak, Rocky Mountains
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Pikes Peak, Rocky Mountains