So, I won't make this any longer and let's look together what I discovered through the approx 20 km I explored while at home on a sunny day.
1. Piata Victoriei towards the museum of maps & old books
2. The museum of maps and old books till Piata Romana
3. Piata Romana till Calea Victorie
4. Calea Victoriei
The theater was built in 1911, and previously housed the Comedy Theater of the Romanian National Theater. It is part of a complex that includes a building with apartments and stores (to its north) and the Majestic Hotel (to its south) (Source)
You can find more details under link from which a summary is presented above. And old pictures can be found under the hotel's website, text in Romanian.
Macca Villacrosse Passage connects Calea Victoriei and a smaller street opening onto the the old center of Bucharest. Campineanu Inn (Romanian: Hanul Campineanu) once stood in the place nowadays occupied by the passage. The old Inn was bought by Petros Seraphim, who gifted it to two of his daughters as dowries. Daughter Polixena married in 1843 Xavier Vilacrosse, Chief Architect of Bucharest, 1840-1848, the Inn renamed after him. Daughter Anastasia married Mihalache Macca, who built luxury shops on their part. In the late 1880s, the city decided to buy the sites to build a Western style passage to relieve congestion. It was designed by architect Felix Xenopol, and opened in 1891. [...] Pasajul Macca-Vilacrosse hosted the first Stock Exchange House of Bucharest. (Source)
Around the Dambovita River
This not an easy one but I will try to collect as many details I can find. Currently known by the name of United Nations Square it was the former Operetei Square. Some of the elements around it or close by are listed and detailed below.
Lahovari Fountain commemorates George Em. Lahovari who was killed in a duel by Nicolae Filipescu as he published some articles where he was attacking the political view of Filipescu. The fountain was ordered by the princess Zoe Sutu in 1903, and built by the sculptor Carol Storck.
Carol Park Area
The Old Town
The Inn's story starts in 1806 when it was built on Bucurs land, on the riverside of Dambovita. Its architecture, unlike the other inns of that time, stood out through its unicity. The founder was Emanuel Marzayan, better known as Manuc Bey. He was a far-famed merchant, diplomat and innkeeper which was considered as one of the richest landlords in the Balkans.