Answer: The United States Bullion Depository, commonly called Fort Knox -- Google Maps link. Dinesh, Ameya, matti tapaninen, Divya Shankar, and Rajesh K got it. Nicely done.
Answer: DC comics. Manasi, Saket, Riskit got it. Dinky cracked the meta connect (DC=600). matti tapaninen and Ameya came close by identifying the protagonist of the first DC comic, Jack Woods.
Answer: The US State of Ohio has special days named after the three people in the picture (clockwise): Swami Vivekananda, Rabindranath Tagore, and (oddly enough) the singer Shreya Ghoshal. Ameya, mekie (wrong singer), Dinesh, Kaushik, and Manasi got it. Nicely done - especially give the obscurity of this piece of trivia.
What is the claim to fame of this piece of glacial erratic?
NOTE: Sorry about the erratic posting over the last week. I will be out of town from this weekend, so if anyone wants to take over during the Christmas break, please let Dinky or me know.
Answer: Plymouth rock, site of the arrival of the Mayflower Pilgrims in 1620.