How many years did it take to build the spanish steps?

How humans modified the landforms? Which counties border the Atlantic ocean? What are the three countries that are peninsulas sticking into the Mediterranean Sea? Where do Anteaters live? What is the largest source of liquid freshwater on the planet? Why does land heats and cools faster than water? Is Lion Bridge a scam? What is the name of the amusement park in the Mall of America? Which is the principle river of the US? How many Central American nations do NOT touch the ocean? How do corals mate? Name the only team from the Pacific Northwest? What impact are zebra mussels likely to have on food chains in the Great lakes? What are the hours of work? How did the Erie canal affect buffalo? What plants are in the Amazon River? Is the Energy near the mouth of a river would generally be higher compared to near the source in the mountains? How big is the Everglades National Park? What objects or creatures in the story magat river that bore the marks of the community? Why do people lift their feet while crossing a bridge?