Where is this?

Scroll down for the answers.

#1: A country with lots of old castle ruins like this one.

#2 Boar Lane once had this city's finest and most fashionable shops.

#3 Salt pans in the distance.

#4 Harvest time, late 19th century...

#5 Cable car system

#6 Which Asian port, circa 1851?

#7 Another castle - which country?

#8 The world's deepest sinkhole - which country?

Answers:

Above the title: painting by Henri Rousseau of the Eiffel Tower in Paris in 1898. Museum of Fine Arts, Houston.
1. Točník Castle (Czech: hrad Točník), a castle ruin in the Central Bohemian Region of the Czech Republic.
2. A painting of Leeds, England. It's by John Atkinson Grimshaw from 1881.
3. The salt pans at Trapani on the western tip of Sicily.
4. Chepino, southwestern Bulgaria, painted by Ivan Angelov in 1905; it is in the National Art Gallery, Bulgaria.
5. Bolivia's La Paz Mi Teleférico, a cable car network. 
6. Hong Kong. Watercolor by George Chinnery of Victoria West and Peninsular and Oriental Steam Navigation Company.
7. Hunedora Castle - aka Corvin's Castle: it is one of the Seven Wonders of Romania.
8. China: the Xiaozhai Tiankeng sinkhole is located in the Shaanxi cluster, Chongqing area.