How much money did it take to build the canal?

When was United States Post Office - Yellowstone National Park - created? What is the third largest river in the world? Why would people rather live in rural towns than big cities? Do tourists visit k2 or not? What was Teddy Roosevelt's famous quote concerning the panama Canal? Does the Great Salt Lake drain anywhere? What famous man-made structure from china can be seen from outer space? Is a sea wall hard or soft engineering? Which wall is the wall of Jewish temple in Jerusalem? Where were the hitites located? What type of currents in the ocean influence the climate of the region as they flow past the land? List 3 tributaries to the Mississippi River? What is another name for east coast ocean? Why did Washington wan to secure the trans-Appalachian west? What is the meaning of tidal delta? Why did the Washington Monument's builders ask states to donate stones? What Mineral is found on alkaline lake shore? Which is the longest and the most beautiful beach in Ko samui? What contintent lies directly South of the Wedell Sea and the Ross Sea? What are the name of the mountain that is a memorial of a US president?