1. Dr. Religa after a 23-hour heart transplant surgery in 1987. The bottom photo shows the same patient after 30 years. He had outlived the surgeon.

2. The 2-year-old Dalai Lama (1937)

3. A shoebill housed in a zoo keeper's apartment in Berlin in 1945.

4. A camouflaged road in Finland during World War II. Trees were hung over the road to conceal it from above (1941).

5. A portrait of Nellie Brown, an African-American cowgirl (circa 1880)

6. At the turn of the 20th century, there was a European initiative to hold classes outdoors. This is one of such Open Air Schools in the Netherlands (1957).

7. This is Nikola Tesla's foot under an X-Ray (1896). The image was taken by the inventor himself, and he had designed the machine itself as well...

8. The insane winter of 1880-1881 in Minnesota

9. Daguerreotype Portraits like this one are among the oldest in the world. Some of the people depicted in them were born in the 1700s, including people who lived during the American Revolution.

10. "Cow shoes" like these were worn by moonshiners to conceal their footprints during the Prohibition Era (1924)

11. The Pamir was the last commercial ocean-sailing ship in the world (1949)

12. British soldiers stand tall as one of the guards faints (London, June of 1966)

13. The iconic Cliff House in San Francisco not long before it burned down in 1907.

14. Animals used for psychological and medical therapy in kids (1956)

15. Mary Wallace, the first female bus driver, in 1974