For a big dose of Hudson River School, Frederic Edwin Church's massive 'Heart of the Andes,' is currently on view in the Metropolitan Museum of Art's Lehman Wing. Painted in 1859, this 10-foot-by-5-foot canvas embodies Church's overriding belief that God is revealed in the wonders of nature. View it 19th-century style: Mark Twain once marveled at the painting's details as seen through opera glasses at a distance, as if scouting an actual scene...