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THE GROTTO Tourism and Conventions - Attractions Click To Visit the Web Site 8500 NE. Sandy Boulevard Portland, OR 97294-0008 Phone: 503-254-7371 Fax: 503-254-7948 Map it using Stroll through this natural 62-acre Catholic sanctuary and take an elevator to the top of the property's bluff for the panoramic view of the area's highlights, including the Columbia River Valley, the Cascade Mountains and Mount St. Helens.